Because it’s able to write boilerplate faster than a human. And because it’s able to perform refactorings that are not possible with IDEs or regex due to their lack of structure. Also because you can ask it to review your files and it does find bugs that would otherwise be missed at first. There’s a huge difference between vibe-coded slop and using the tools available to you effectively.

you tell me, since you said you’d rather not help at all

If only there was a way of helping without being condescending or immediately assuming oneself to be more knowledgeable or capable on a topic with nothing to base it on other than physical appearance.