Many designers that come from web design ask the user of a mobile interface to enter the email address or other similar details twice, that is so they can make sure there was no typo done when entering those. For me the solution to this “problem” causes more negative externalities than anything else.
First I would like to know how often does it happen that users enter and incorrect mail address.
Second what is the most common mistake: Forgetting your password? Or the email you signed in with?
It would be great if on mobile interfaces we tried to help the mobile user as much as we can by not asking him/her to type unnecessary extra information, let’s just ask them once what we want.
I know that some back end services require this type of data to be filled in twice, but hey 😉 there are many workaround for that.