Just remember, we traded Midara, a completely flashbacked/lore-filled/"epic" badguy, for THIS.
So according to logic she isn't teleporting them to different parts of the world but different dimensions. The utter stupidity of not leaving them in there and being done with all this is hilarious.
Btw wouldn't Kaguya just throw another bone-spike? O_O?
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Also by logic they can't go back to their own world. Only obito has that power and he has to use Kaguya's ability.
If the gravity is so heavy, then
A) The projectile wouldn't work.
B) They couldn't possibly survive after the fight.
C) God only knows the medical problems involved with that.
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Oh look, Bleach > Naruto again. What a shocker.