I don't think it has anything to do with wisdom and more to do with, "This is the first time I've tried this, and magic is an imperfect science."

[ at least she's honest. ]

I tried to pull people who were available to spread my work without risking their own universes, and obviously, that didn't work out . . . amazing? But your world won't notice your absence. We're inside a little pocket of time, here -- time, at home, is frozen. No harm will come to it while you're here.