On the 2020 Bcon tape Johnathen Williamson (cofounder of retopoflow and CG Cookie admitted that he was spending a lot time starting up a brew shop, I think he is not concerned with supporting blender anything including retopoflo much as a few years ago.
I've been regularly using the addon quad remesher in blender for a long time now, and it is indeed quite good at what it does, but lately, I've been working quite a bit with human sculpts, and for me, retopology is always such a pain if you work with animation in mind. And especially manual retopology, I always hated it
Here you are pushing for retopo tools that are done by third party crews even for the devs team of Autodesk/Blender. (Maya bought the quad draw modeling toolkit plugin an integrate it to the soft)
(Anybody that would like to do some correct retopo in blender would use Plugins like retopoflow done by external team)
Without even talking of specialise software like topogun.
I hope this shows you how a retopo tool feature complete is hard to pull off.