That's not UX though, it's more theming. If themes affect your UX then there is no pleasing you.

True enough I'm happy with flatpak but I never stray from the default GTK themes.

I was unhappy with flatpak until I found Flatseal, now I include it on all my workstation setups.

But I can't help you with the theming unfortunately, I think that's a sore point for a lot of users that like customizing their Linux DE.