I can't speak for everyone, but lots of us fully understand that the AI tooling has limitations and realize there's a LOT of work that can be done within those limitations. Also, those limitations are expanding, so it's good to experiment to find out where they are.

Conversely, it seems like a lot of people are saying that AI is worthless because it can't build arbitrarily large apps.

I've recently used the AI tooling to make a docusign-like service and it did a fairly good job of it, requiring about a days worth of my attention. That's not an amazingly complex app, but it's not nothing either. Ditto for a calorie tracking web app. Not the most complex app, but companies are making legit money off them, if you want a tangible measure of "worth".