OMG ADC AREN'T WORTH PICKING.
Meanwhile ADC + dedicated support (Because let's be honest, poor support player are looked upon like slaves from ADC overlords) meta is the only one that hasn't changed since oh, FRIGGING FOREVER and no matter what team comp you are going to take you'll see a HIGH DAMAGE DEALING RANGED CHAMP
No honestly, outside this last part of this season, Riot never tried to change the botlane meta, i find it actually thrilling to face anything than the standard bot duo, Riot finally is trying new things directed towards botlane, with Morde we have an example that this is a reality and can improve further.
I've seen midlane chaning from assassins to mages alot, Top lane has changed not as much as mid but most of all, as always the most impactful "role" to play, that has changed more than anything with the biggest effects, is the JUNGLE.
Junglers since the dawn of times, are the true overlords of this game for the majority of time, forcing players to adapt every new season to a new playstyle, and often enough changing even lanes for how hard to balance the usual items are (Ezreals mid abusing new AP jungle items, or not so long ago Cinderhulk toplaners to, literally anybody with a 3rd hit AA ability trying to abuse the funk out of Sated Devourer.).
After all of this, once again, the only STALE, ROCK SOLID, TRUE ICE FROZEN gameplay has been the standard bot lane duo of a ranged carry and a ~~ personal slav~~ Support.