My games have been a wildly mixed bag since season 8 launched. I either have teammates building basic attack Janus with no boots and getting sub 2k damage or we steamroll a game with sub 5 deaths with enemies feeling like brand new players. Did MMR get rest across the board?
MMR resets only apply to ranked modes, and always have only applied to ranked modes.
Likely what youre feeling is a large influx of returning players