Doesn't it help ensure the user is using a phone and can get notifications when you couple it with a text message code entry? Then you can skip the typical auth

Doesn't it help ensure the user is using a phone and can get notifications when you couple it with a text message code entry? Then you can skip the typical authentication flow? I would think it would be quicker overall for signup and for making the code simpler but I guess weird for users not used to it.