If you look back at the history of dunking, there are a few points where things changed. Wilt Chamberlain could dunk from the foul line so foul line dunks were outlawed.
Chamberlain and Bill Russell could dunk but rarely did so with more power than was needed.
Connie Hawkins was one of the first guys who brought people out of their seats with dunks and later ABA stars Julius Erving and David Thompson started to electrify fans with insanely athletic dunks that had some pop behind them - especially Erving, who felt unleashed when he was able to start dunking in the ABA.