Technically, nothing you use in tech is ever really "simple", there's tons of complexity hidden from the common user. And whenever parts of that complexity fail or don't work like the user expects it to, then the superficially simple stuff becomes hard.

Docker and containers are a fairly advanced topic. Don't think that it's easy getting into this stuff. Everyone has to learn quite a bit in advance to utilize that.

To play games, you went into the wrong direction when fiddling with wine directly, or even just indirectly by using bottles You COULD do that, but you've literally chosen the hardest path to do so. You should use something like HeroicGamesLauncher, Lutris or Steam in order to manage your games, install and launch them fairly easily. These will take care of all the complex stuff behind the scenes for you.