My experience is that agents are decent in coding a feature, solving a bug - doing specific well defined task. They are very bad at judging UI/UX and user flows through app. Like really, really bad. They can quickly put together vibe coded app but make it usable takes a lot of extra manual work.

Did anyone solve this problem? Any good approaches?

I confirm this diagnosis. The UIs are always clunky, disorganized, and kinda ugly. But they work well enough. I guess UIs are opinionated enough that we probably all customize them anyway. Maybe the agents know this so don't bother putting too much effort in? (Deep thought of the day: acquired)