Technically no, just a trim ring around the neck pup is all that’s required.
^Pretty much this^
Above all else it has to sound good, once past that it has to feel good (weight, ergonomics, fret ends, neck size…) then a very distant third is how it looks.
I will admit that in the looks department I do have a couple of NoGo lines that I’ve drawn, where regardless of sound and feel I ain’t buyin it, namely Lakland basses. I’ve played a few that sounded and felt very nice, but I just can’t get past that butt ugly bridge. Their only bass that remotely looks nice with that bridge is the semi hollow body, the rest don’t inspire me in any way shape or form to even pick one up. And Antigua finishes that have aged to baby poop green don’t really appeal to me either. But that’s about the only exceptions.