Ah, I figured out why @godotengine appears barely-supported when you look at its Q&A forums: they use Discord, so people post a question, don't get an answer for a while, then go into Discord to get their answer, and the answer is promptly lost to posterity.
This is no way to support software. Use forums so people don't have to keep asking the same questions over and over.
@godotengine Oh, sorry, you use Discord *and* IRC *and* Reddit *and* Facebook *and* Twitter *and* Github *and* Youtube *and* forums *and* Steam.
If you were actively trying to sabotage the community, I'm not sure what you could do that would be more effective than scattering it so widely.
The problem turned out to be that making user-defined reference-counted classes is extremely difficult, so forget doing basic table-stakes stuff that's trivial in Lua, Python, Tcl, Guile, Duktape, and dozens of other existing embeddable interpreters that the Godot team inexplicably decided to bypass in favor of their weird hybrid of Python and C++.
As Alan Perlis said, it's easier to write an incorrect program than to understand a correct one.
The way I discovered this was by stumbling across the list of things they want to fix in 4.0, and the inability to make user-defined subclasses of Reference without "dirty hacks" is on the list.
On the bright side, even though the scripting language and APIs are atrocious, I really like Godot's editor. I suspect this is the main reason it's been more popular than projects like Panda3d.
Second Life's horrible scripting language was a lot of people's first programming language for a very similar reason. Composing scenes in code is extremely hard in any language (except maybe Racket). The logic is mostly just glue, and having a reasonable IDE that works out of the box is a huge help.
Anyway, I'm now able to import MMD (MikuMikuDance) models directly into Godot with textures, using no external dependencies other than my GDNative library. The materials are wrong because I'm using SpatialMaterials for testing, but I don't think making shaders that look right will be too difficult.
After that comes bones, the different kinds of morphs, rigidbodies (for physics), animations, then maybe softbodies.
A social network for the 19A0s.