I don’t think tailwind or its templates are the issue (and believe me, I am the furthest thing from a tailwind advocate).
Just shipping a tailwind template is lazy and trite. But LLMs are made to optimize for the lazy and trite. They can only choose the lowest-common denominator.
LLMs don’t really know how to give designs personality. Most of the time I see attempts to improve the situation that basically just boil down to vibe-coded slop that’s prettier. I’m sure better designs exist, but the ones that do exist are almost certainly about the person who drove the LLM, not the LLM itself.
I know this may be a bit dismissive, but I think the need to ask that is the problem. AI can definitely build a design for you. But is no substitute for design skill.
The best way to figure out how to prompt an LLM is to develop design skills so you know what to tell it.