The deleting of an element for verticale space

“Our phone doesn’t have much vertical space.
Let’s remove the unnecessary elements so we can start building our CatPhotoApp.
Remove the unnecessary text”

What does this mean? Why do we have to delete it because of vertical space? Doesn’t phones also should have h1 elements so as to classify the order? Why h1 isn’t necessary in this case?

I wouldn’t overthink it, the challenge is just showing you how to remove HTML.

Yes, an h1 is just as important on a phone as it is everywhere else. You wouldn’t normally compromise semantics just because it’s for a phone and “need more space”.