I have depth/breadth experience in Zen training. It is extremely boring throughout the static practice for a great deal of people who had been practicing for a while. Before that, I heard reports of (and myself experienced) ego-dystonic cognition.
In active practice (doing other things while still being in terms of what you're calling wider "breadth"), for me-- at first-- I was more alert and tended from moment-to-moment better. At the very first, I was creative and felt very connected to myself (first 7 or 8 months). After about a year and a half, I started developing temporary psychosis (prodromal schizophreniform).
When the 2-and-a-quarter years mark came around, I was in full-blown psychosis, chronic and acute. Actually, after intake into an intensive outpatient "bridge" program, they showed me a report of their initial assessment (diagnostic impression).
The words on Axis IV: homelessness, self-annihilation
I have no idea how, but I experienced full ego-loss after 2 years of Zen. I escalated through these "gates" so quickly that-- after sitting about 25 minutes, like clockwork, some of my bodily regulation failed and my executive functions almost entirely shut down. I felt all my senses-- more than the external 5-- so acutely at that point that if I broke concentration on my "hara" (lower abdomen; higher pubis), tension would rack up from my tailbone in succession up to the top of my spine. At which point, I would scream uncontrollably about nothing other than releasing tension.
When in full lotus, if I didn't scream, my upper spine would start pivoting my tailbone in such a wide fashion that {--> right-knee --> left-knee --> left-buttock --> right-buttock -->} would lift and then come down to the mat (zafu) in that order.
So I was basically a human Weeble intensely energized but completely derealized. I believe my ardent practice prevented me from hallucinating. My psychosis was "simple" until the last few months of my practice in late 2012 (all negative/shutdown symptoms, and one specific positive symptom, disorganized thought).
At the very end, I was doing less static practice (shikantaza was my only static practice), but still perseverating the active practice-- because I had so much gd intensity in my viscera-sans-what-most-people-call-"affect" though I was clearly affected (I stripped all emotions back to sensations in the body, but dissociated from the sublimated ones).
During that small window of time, I developed delusions, thought-insertion, paranoia and disorganized thoughts. My assessment of functioning (GAF, Axis-V per DSM-IV-TR) dropped below 50 and I was committed to an inpatient ward at the same facility.
I kept going in my Zen practice, and experienced clinical trauma that I wasn't able to feel until after my psychosis fully deactivated, which required I drop all those practices (due to traumatic associations, that also triggered some executive function disabling) I did in Zen. I switched to a mixture of Jungian archetypal psychology, Taoism, with auxiliary sensory aids from a local pan-spiritual shop (stones, scents); that combination snapped me out of the executive function relapses but still kept me in the same affective space of my active Zen practice.
ZEN
Insights galore! --> Creativity --> Boredom yet strangely an emotional freedom --> Derealization with the same emotional freedom (and an almost entirely lacking cognitive involvement --> Simple psychosis (including loss of affect, when I was already cognitively inactive for the most part) --> Schizophreniform Disorder.
TAO (+ other shit)
--> Simple psychosis --> Partial remission (remaining derealization) --> Boredom + Emotional freedom + cognitive presence) --> Honestly, stuck at boredom.
ALLOWING MYSELF to be autistic (I'm diagnosed, level-2 severity sensoribehavioral, Severely-impaired immediate/working memory, level-1 socioemotional, Above-average nonverbal IQ composite, Highly-superior/genius [but I don't like the latter] verbal IQ composite)
--> Boredom almost entirely absent, awareness of all-the-things-in-my-bodymindheart-whatever extremely high especially when well-nourished --> awareness the same, plus socioemotional insights frequent and sometimes distressing --> "Sage'ing out", when I discover things with very, very little information or exposure, only to find out later that there's entire pools of emerging authors and social scientists (and behavioralists) expressing very recently these same connections/things, in both metaphysics and politics.
--> Hence me being here. I now do Zen if I'm under a time-constraint in combination with emotional dysregulation. 25 minutes pro re nata. Good enough.
However, I will say that since for ethical reasons I've divested myself from nearly every institution other than gasoline, not even the automotive industry (I buy locally, paid-in-full), post-secondary education and the workforce.... In such a hyperindividualistic-yet-strangely-conformist/work-drone'ish culture, that means I have almost no one who even remembers how to maintain an informal, unstructured affiliation. And the ones that do remember are either diagnosed schizophrenic or on hard times (thus disconnected from the workforce as well).
I assert that the U.S. is sadomasochistic as a means of being slaves at work, compensating after work, and needing to create frequent mini-psychodramas rather than fluid friendships... Because the former drives them (without awareness) into their repressed stuff, while the latter requires awareness lest you lose your friend by being unkind or inconsiderate.
Perhaps both low 5-HT2 and 5-HT1...?
I feel like every purchase is consent to a pain and stupidity machine. My ability to see histories (and synthesize from effect back to multiple possibly causes) has increased, which is what the Taoism section reminded me of. However, it isn't done with words. I don't know how to describe it other than a series of feelings (beyond the primal) that chain together, draw me in, increase my appreciation for things both enlivening and distressing. More curious, and even if it's distressing, eventual gratitude and coherence. Like everything is as the historicities of all the people involved co-created, even if they weren't aware of co-creation.
For example: Gratitude and acceptance (not ethical acceptance-- some of these "all the people"s be damaging and somewhat disgusting). Of people as foreign to my ethics as White supremacists and conversely Anti-fa.
Idk. As long as it is in-step with what people have paved the way for, I find absolutely no anxiety whatsoever, or cognitive impairment. It's only when it doesn't make sense (yet) that I'm anxious/frustrated for a little bit.
idk if this can help you, but it seems like my 5-HT{1,2,7}, Alpha-1, and occasional Alpha-2.
(I'm not a particularly sentimental person, so I was never incentivized to continue practices like metta, though I do know easy ways to trigger that, [that I learned actually through Neopagan "darkwork"], loving-kindness and affective empathy.)
I'm assuming autism's genetic influence on 5-HT and other receptors (via segment duplications as well as deletions, and some larger structural variations in the genotype) causes some of this naturally, which would explain why Zen was basically overkill, and Tao was basically under-kill.
I like my way of being, sans any exogenous influence, aside from how it affects my timeliness in doing things I find somewhat insane, and affects rapport with low-autistic-traits people.
Maybe all the spiritualities in all the world were trying to create autism? (That's a bit self-aggrandizing, so my tendency is to dismiss it after suggesting it.)
---Keric