Smalltalk takes a hardline view on syntax errors and undefined variables: you can't save a new method until it's fixed.
It's a nice way to work, as methods tend to be small, so virtually all your code is in a runnable state all the time.
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I think you could build an interesting IDE with a tiny embedded LLM in addition to the usual tooling.
Features like 'extract method' would be much nicer if an LLM could provide a name. Choosing a good name is virtually impossible from just a typed AST.
I'd heard the conventional wisdom that UX research states that mice are more efficient than keyboards, but turns out there's virtually no research on this!
Some of my OSS projects are largely feature complete. For them, virtually every commit is just fixing bugs reported.
It's a strange routine, because it means the time I spend maintaining is dependent on the bug report rate, which largely depends on the size of the user base.