Some people may say no because you can't do it ingame, but I take a vote at yes. Here's some reasons:
1. The NBTtags were put into the game, and MCEdit is one of the only ways in the game, in game does not work. That means they put it in there for a reason, which kinda shows that Mojang wanted it as part of vanilla.
2. It's kind of basic for vanilla adventure maps, because if you installed a mod, like Mo' Creatures, made an adventure map including it, and loaded it into vanilla, it wouldn't work, as if you did that with MCEdit, like many people have done, it does work.
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Minor dupstep... Doomsday. DUBWUBWUBWUB, WUBDUBDUBDUB, DUMDUMUMDUM, WUBWUBWUBWUB!