Or people who don't want to go scanning random crap that MAY be a restaurant code.
Or people who forgot/lost their phone.
Or people who intentionally have a feature phone to get rid of gamification crap.
But yeah... I guess it does keep out older people too.
I never scan QR codes, because you never really know where that code goes unless you printed it.
(And for what it's worth, most McD's have flipped their counter service with a human to be the same queue as the drive through. I just tell them I have cataracts and can't read the board, tell them triple cheeseburger, small fry, etc. My order goes in as the next car, but they bring it to the counter. On a busy day I get my food way ahead of anyone that used the kiosk, or walked in and used the app. )