It is not when you stop kidding yourself : using AI has nothing to do to improve the quality of the code. It is a vanity status, at this point.

Using AI is vanity? I've never heard that before. Why is that?

Refusing to use AI honestly seems more like vanity to me. Like "no machine could ever do what I do".

That said I would not necessarily accuse people who don't want to use AI of vanity - there are good reasons not to want to use it - but if someone else did it I'd find it easier to understand.