I see it like this

People who stick to single main no matter the meta are more likely to have more fun playing the game (because they're playing a champion they enjoy), but less fun in the balance long haul

If you choose to continuously stick to a single champion that you want to play (a main, or a couple of mains), then you should just suck it up and adjust to the meta and the champions being picked in that meta, sometimes it'll be in your favor, sometimes it will suck for you, it's a choice you chose, just play through it and adjust as needed, be it you need to play safer, adjust your build, etc etc

If you're a meta/all around player who constantly changes which champions to play to fit the meta, then you probably don't have much to complain about, unless you don't enjoy constantly switching champions, then you should switch up how you play the game

Adjusting how you play the game is key to having fun in the game, complaining about things and getting stuck up on certain things isn't gonna do it