I know this topic is gonna kick off a firestorm, but I'm that kind of guy, and it's eventually gonna come up anyway so might as well get it over with.
I don't think it's "right" that we're able to switch between Creative and Survival, even though the 'command' screen. Are you really playing 'Survival' if you can pop into Creative whenever you want and get all the weapons, items, armor, or even fly way from monsters... without penalty?
I know some of you are gonna say "But I want to play the way I want to play! I want to do whatever I want!!" Really? You're going with that? Or "It should be my choice. It should be up to me." I don't think it should be up to you. In virtually every game you have to play within the constraints of that game. I don't think RW should be any different.
If 'survival' is your thing, play survival.
If 'creative' and building is your thing, play creative.
There's nothing wrong with having a world for each mode.
But I don't think it's 'fair' to play, or have the ability, to play both modes (on the same world), especially whenever you want. When you know you can switch, it changes how you play the game, and changes your mindset.
That's my thoughts.
What's yours?