Oh yeah? We have just the same point in "Trivia" section about the Lunar Base. And if there MAY BE some logic to have oxygen on mothballed lunar base, there is absolutely no reason to have oxygen onboard of military spaceship! Especially if her crew didn't need oxygen at all.
Additional mass to accelerate, the fire risk, the danger of explosive decompressions under combat damage... Basically it's a bad idea to have oxygen-filled warship even with human crew, exept the living sections. For the Gems this is counter-logical.
Not quite sure why you reverted the edits. Mine were more grammatically correct and showed progressive logic from singularity to plurality. I will not revise back to my own without some dialogue about your views and intentions, as I don't want this to get into silly internet war or perceived passive aggression. :> It's very clear that you love Steven Universe a great deal, and I'm not here to trample on that. I want this wiki to be the very best it can possibly be, and that's going to start with communication and friendship.