As is casting fire from your hands or absorbing the souls of dragons.
Much can happen in the realm of fantasy.
But again, there's a difference. People expect
big things in fantasy, but what they also usually expect more mundane things to work like they do in the real world. Water flows downhill, bears bit and claw you, bees sting, falling 12 feet will hurt, falling 200 feet will kill you, etc. and so forth. And one thing that should hold true in a fantasy world just as in the real world is, when you take the time to learn something, you can't later decide "I don't think that was worth it", and then swap out that old knowledge for some new, different knowledge that you think will be more useful. You can take the time to learn the new knowledge, but it's going to cost you time and effort; you can't just swap old knowledge for it.
Suspension of disbelief is a fragile thing, and must not be abused.