"You don't randomly start it from scratch whenever you run a game..." Uh, this is exactly what I do. What's so special about an app that launches apps that it needs to be left warm constantly?
If you don't, nothing special happens either: you just wait 7-10 seconds, hardly an eternity, and there's really no rush to firing up a videogame either. We're not talking in-game responsiveness, the only thing that truly matters.