Why doesn't this game have a Retro game mode?
every game has one except WOW that deleted the vanilla server, and... and?
League
i mean what harm could it bring to the game? dota2 has a retro game mode and nothing happens to the main game, i think we all know why league doesn't have one
because everyone wouldn't play the game anymore, we're all exhausted of season 7, we're all exhausted of getting gangbanged bot lane by 4 or 5 people or the jungle being ruined by vi/lee/heca we're all exhausted of seeing mages bot lane, if you're not i do because nothing is more frustrating than a "support" vel'koz/annie/brand/zyra/malz bringing more damage than an adc with little AP while bringing almost as much utility as normal supports Mid lane is a shitfest of mages, overshadowing every assassins Top lane is a shitfest of overpowered picks, old bruisers like renekton/wukong/jax just disappeared from the game and it won't be fixed because riot wakes up and changes 3 champions on pbe and then call it a day and wait 3 weeks to change 3 champions again
Champs get destroyed with their rework
begging riot to revert their shit because the champion is no longer enjoyable, but hey i don't main rengar and malz i wonder what will happen to my main 
Please just let me play your old game riot, you were amazing back then let me get season 3 or season 5, the old good league of legends that didn't finish at 15 min that allowed us to show our mid game/late game skill and decision making, the good old game that had so much versatility and diversity where Lee sin was as viable as other picks until you buffed him 2 or 3 times.