Hmm.. You should watch the Therapist (Viceland) episode with Joey Badass. It's a bit of a weird one. The internet is full of conspiracies about his death, but Joey thinks he thought he was dreaming when he jumped from the building where they used to Freestyle.
And don't hate on Mumble Rap. It's its own thing and should be judged as such. Like Metal to Rock. We just don't have the good classification yet for the entirety of Rap. Any ways, you can still find some underground guys that rock lyrically. Keep holding on Pro Era tho!