Why "URF" was a "Burnout" mode

Originally, it was a fun mode where EVERYTHIGN was crazy. and then riot added "balance" by nerfing all of the fun out of the best champions. they claimed that it wasn't "fun" when certain champions were OP but that's rediculous because there was so many that were top picks you couldn't just eliminate them all. the FUN came in from abusing everything as much as you could. it started burning out because they made it less fun by nerfing urf champions to unfun states. statistically, yeah, sure it burnt out over time. but has riot considered that's a correlation rather than a causation?