I agree. These new (or old) notes that were not allowed, politically, have altered the way we sing and play. Some time has to pass before these new (or old) notes become acceptable. Hence, blues and rock and roll. There have been many ingenious people that have tried to make this music legit. You must understand, that politically, in R&R's early days, was STILL considered the devil's music. It is not over-theorizing, but making those new (or old) notes legit in terms of tradition. What's interesting is, those notes that are slightly out of tune, changes function. Anytime one plays a blues or blue scale, you're really playing a view of the overtone series. At one time, this was unacceptable.
It has finally become en vogue. Anyone and everyone can play or sing # or b and it's perfectly acceptable. Ironically, a full circle,... of 4ths and 5ths. That's the control.