The annoying one on iOS is how often it makes me re-enter my Apple ID password. In a modal, of course, so it's impossible to bounce out to 1Password to copy the (very long and complex) password without dismissing the modal first. Sometimes I'll get a "re-enter your apple id password" modal at some random time while I'm doing something else, dismiss it to go get the password, and then have no idea how to get it back because I don't know what triggered it in the first place...