They split the community up, especially twisted treeline... riot put so much effort into keeping it functional and the community still didn't like it smh...
and what about Nexus blitz, a colossal failure and they could see it being garbage in just the first week of play.
ascension and dominion were a snooze fest
odyssey got stale quick and had no real uniqueness to it
I'm just glad we have 3 modes so the community is never split up again and we can be greatful for the fun and engaging times we have playing SR, ARAM, and TFT (with my wife of course)