Why do you need “vibe coding” for UI/UX customisation?

Why can’t you have a regular app that has customisation features (can even use LLM or ML tech)?

I am hardly anti-AI and I’ve vibe coded some small elements of my work projects (very simple modules with extremely clear input -output requirements in a domain I have a lot of business experience in), but this seems like AI for the sake of AI (or hype and PR associated with what is marketed as AI).