ADC is the best role

ADC is the only role that you need to have every game, top has a variety of picks like tanks, bruisers, and juggernauts. Mid has mages and assasins, jg has all sorts of stuff and support has peel, engage, poke, utility but ADC has always been there.

If you look at ADCs most of them have high play rates and good win rates and whichever team does t have the ADC usually ends up losing. When the Crit rework came it was the only meta (not counting season 1 because it was so weird) where ADCs weren’t always needed