As far as Phones are concerned, is there any meaning in going beyond 1080p?
I used a LG at 1440p in the past, and am now using a Xiaomi mi mix 2s (1080p)
It's been 3 months now with my new phone and I see no difference in sharpness, or at least nothing that would make me go "Oh yeah that's absolutely necessary"
Now I understand that some people do VR with their phone but for the average person I can't see how 400ppi isn't enough for a 6inch device
Even phone reviewers are more concerned with the panel quality than the resolution (except that whole iPhone XR thing)