While this is true, I play at a PC café. Often times I find myself at a different computer. I'm excited to join a game with friends so I forget to turn the setting to my preference and once you are in the lobby you are screwed. I cannot hear my friends in curse chat or Skype because the music is so obnoxiously loud on default settings. It's just inappropriate in my opinion. We are trying to discuss what champs to select and what's going to happen in game.
It's like this: If you can make it possible to turn it off during champ select, why not do it? It is a very useful setting and I feel like that "we already have the setting before you enter champ select" is a cop out.
We already have classic champion skins. Why make more?
We already have champions. Why make more?
We already have a summoner's rift, why did they make a new one?
We already have content why ever add anything to the game? Do you see how that doesn't make sense?
It makes the game literally better to add that option while in champion select.
It's something much more useful than a new champion skin and it should be fixed because it bothers a lot of people.