I'm on board with not allowing paste into a confirmation field since you might have copied the wrong number so there's nothing to gain from confirming the same

I'm on board with not allowing paste into a confirmation field since you might have copied the wrong number so there's nothing to gain from confirming the same mistake. Imagine you're doing several transactions and on one of them, you don't quite press the copy key correctly and end up using the previous account number from the clipboard.