Don't get me wrong here. Where I say "busy" I don't mean their work wasn't important (it was!) but we had our own projects and jumping on a call to improve errors messages is not too exciting for most of us - and it's not the stuff that drives promotions. As a develper it's simply to easy to gatekeep code.
Now follows a shameless plug: I'd be so excited to hear your opinion about a tool I'm building. It's called https://api-fiddle.com. Conceptually, it should help developers work API-first instead of code-first. It's great for devs because it makes the work faster and safer. BUT, an added benefit is that API docs are no longer burried in code and technical writers have a nice interface to contribute to them (and hold devs accountable!).