"Better off" seems subjective, especially when looking at the particulars.
I didn't grow up in a diverse community, and living in one now I certainly feel the lack. How do you quantify a cultural divide? How do you quantify what it means to you?
Given your comment, I can guess, but that would be rude.
I'm sure there are awesome monocultures and ideologies one can wrap themselves in permanently, but every one I've been in for an extended period looks like a prison in hindsight.
How do you know this?