There's nothing more anoying than shooting Horizontal shots Vertically on one's iPhone.
You have two eyes, mounted on your head horizontally. Your TV has a horizontal picture as do movie screens.
So why do so many many smart folks shoot their Smart & iPhone shots vertically??
There is little to see on top or bottom of your subject. And usually lots of interest to the sides.
And as for VIDEOS, how stupid do those vertical images look on the TV news, facebook or AFV.
GET WITH IT.
Yes, there will be occasions you will need to shoot vertical,