I gave TiddlyTalk a go, and it is like death by a million cuts, cognitively speaking.
Too many design issues with TiddlyTalk for me to operate with it.
The design of GG, for all of its warts, works for me because of lack of features, because of the simplicity.
So I just have to manage sensory/cognitive overload and over-stimulation from: number of discussions, number of participants/members, number of forks within one conversation.
GG feels very much like Gmail, so there isn't much, if any, of a transition from one to the other. Continuous transitions in how to think/work/anything, that gets pretty nerve-wracking and exhausting.
So if there is no cost/burden/inconveniences to the current integration of the two forums, please keep this GG around. (Worst-case deal, I can create my own GG as a place to share code/videos when it is time to pull the plug on this GG.)
I really don't think TiddlyTalk can be modified to accommodate me, and I don't think it should be modified to accommodate me. I believe TiddlyTalk is best for the community as-is.
Besides, trying to explain every little thing that is challenging to me, and why it is challenging to me, that is way too overwhelming (more to think about, more to somehow communicate, ...). And depressing.