Asked it (ChatGPT) to do some Linux joystick stuff. What it produced was almost usable! Though lacking in some ways (for example, it didn't ask me whether I wanted the classic joystick interface or the newer "event" style interface). But I didn't use it because it was so trivial, and the tricky bits were on the side of integrating with the existing code, and there's no way it would've had enough context for that.

Also asked it to produce some pipewire implementations. That was a joke, couldn't even get close to anything that would work. Functions and values that don't exist, etc. Don't think it even got the general structure right, hah. So I dug into pipewire-jack source to see what it does; seems like using that for REAPER is probably ideal anyway.

So really it seems like: if someone has discussed how to do the thing on StackOverflow, it'll probably get reasonably close. Otherwise, it's trash.