I love cursor, but yeah no way in hell. This is where it chokes the most and I've been leaning on it for non trivial css for a year or more. If I didn't have experience with frontend it would be a shit show. If you replaced a fe/designer with a "prompt engineer" at this stage it would be incredibly irresponsible.

Responsiveness, cohesive design, browser security, accessibility and cross browser compatibility are not easy problems for LLMs right now.