What I would really like is something I saw someone talking about here; I'd like the editor to brighten text it finds "unexpected" which could immediately alert to bugs, or to the fact that the code I'm writing looks weird in some way and might either be restructured or accompanied by a comment.

Yep, these kinds of applications are on our mind! We consider autocomplete to be the "baseline" task since there are plenty of benchmarks and research to compare our model's performance to, but there's lots of things like highlighting code, upgrading to new libraries/conventions, etc that we can do with a good base model.

my unsolicited advice: pick an X. what is the one best use case for this other than code? law? finance? focus on that vertical. if you have no idea what that could be or if that market is too small, you're already in trouble.

I don't use anticomplete at all. What I would like is something that can take my current, bad code and style transfer it into proper, modern code. best case, take code as I write it naturally and confirm it to the style guide of my organization.