[brewdad]

The biggest hurdle to authenticator app adoption for the masses is the one that only bites you a year or more down the road when you get a new phone. If you didn't transfer your seed info over to the new phone before trading in the old one, you are locked out of all your accounts.

[slothtrop]

for this reason I've kept storage in keepass and backed it up in more than one place, but admittedly it's possible to lose everything. You need to expose yourself to a little more risk just to mitigate that possibility.

The other issue is that many smartphone owners don't have a computer they would back things up to. Just "cloud".