In a way I disagree with you. As I see it, clean design is a way for the app NOT to stand in the way of what the user wants to do. It is very easy to throw everything into an app with little polish and leave it to the user to rummage through the resulting mess to find what they want.
I am all for creating new things, and agree we shouldn't copy things for the sake of copying; we should copy what works for a desired purpose. As it already is, Nostr and its concepts can be complex enough to most people that we don't need bad UX aiding that.
We can have good looking clients that respect user freedom/choice and don't impose their will down user's throats.