I happen to be flying right now in F on another domestic airline that does have screens. Looking around the cabin, the majority of the F cabin is indeed using their screens- even if it’s just to watch the flight tracker (which is unfortunately something AA doesn’t have in their in flight portal- something even WN has).
It's not hard to track your flight on Google/Apple maps.
Having the screen tends to preclude having a device holder, making it more difficult to watch your own content.
I would imagine that those with the flight tracker up aren't actively watching it, and wouldn't choose a different airline if they didn't have that option available.