This game has definitely gotten better over time. You ever seen old twitch/youtube clips before the visual update? I don't think players realize what they asking for when they talk about prior seasons. Every season there is something broken. Dragons are worth fighting for now, there is a rift herald that can be taken, masteries that make you feel like changing them actually matter, tons of new champions and reworks, jungle changes, support changes. Like yea... its not perfect but shit is def better now than it used to be. People get so hung up on good memories they forget all the old things they used to qq about.
If Riot patched the game back to say season 4 or season 5 (ok yes solo/duo queue would be sweet) people would be sad. I know I would be bored as fuck like... yea I might not play all the new champions but the game would seem so dull. Some people strive better in certain metas I get that but honestly I can't remember any season worth going back to. I don't agree with all of the changes but the game still feels fresh to me. If nothing ever changed what would be the point of continuing to play?