> shitty 3D prints don't count

Why not? The 3D print market is pretty large and tools to generate some designs that can then be tweaked are pretty useful in that context. I don't think that type of AI CAD tool would replace professional CAD work, that's something that requires way too much context and human judgement. But being able to prototype something to be 3D printed via an AI thing is one of the few places where I see AI being genuinely useful.

I personally enjoy designing my own things with Plasticity, so wouldn't be the perfect target audience

Yes I intentionally called this AI TinkerCAD