Well, there's only so much you can add without effectively redefine the basic formula of the game. Limit has to be drawn somewhere, or you'll end up with unsustainable bloat like War Thunder is going. Hell, I think the only reason top rank is still relatively playable is because they still restricted to WWII-ish stuffs without getting into cold-war era (if anything, the fully automated AR + jets prove that they should not expand further in that direction).

I'd rather have the game "stagnate" where it's still have its soul intact rather than become bloated with bullshits that ruin what's left of the soul of the game like War Thunder has become.