It was most apparent in Fortnite because Fortnite added a competitive ("arena") mode, which is by definition SBMM. The problem a lot of creators had was what was the point in unranked mode ALSO having SBMM? I'm sympathetic to that argument.
Forcing SBMM in all cases just seems like it's meant to protect n00bs from getting crapped on but isn't this coddling players? There's something aspirational about playing better players, no? Also, "smurfing" (creating a new account to play against n00bs) largely defeats this anyway.
If n00bs wanted to play against only other n00bs couldn't they play in ranked mode where that would happen?
More relaxed modes tend to be better viewing. That's actually good for the game IMHO if streaming it has longevity and audience retention.