I don't think everything needed to be boom-bap, but the south, with the exception of a few artists/groups, certainly didn't concern themselves with maintaining the standard of 'skilled MCing' set by the east coast. I don't think 'being nice' mean as much in any other part of the country as it did on the east coast.
The south used rap purely as a hustle.
The problem with that is, because of rap's influence, being simple-minded AND ignorant as fukk became cool. Entertainers are trend setters, ESPECIALLY in our community, and especially rappers.
And someone up above hit it on the nail: I've heard soooo many people dismiss rappers with skill. 'We don't give a fukk about that bullshyt!'
I'm proud to say I've never had a friend or even a close associate who didn't appreciate lyricism. I don't think it's a reach to say, there is a connection between that, and every single one of my friends and associates being regarded by the people that know them as highly intelligent.