245 ppi is nowhere near what the human eye can perceive. You can make all kinds of assumptions about view distance and so on, but higher resolution is almost always a better thing when rendering text, rich content, and so on. You kind of sound like the people of the past who said "we'll never need a terabyte of storage" or "256 MB of RAM is enough for anyone" and so on.
Just because you can't perceive individual pixels doesn't mean you can't perceive higher quality. Imagine if you wanted to draw a human hair to scale, you would need some small pixels to make that look good.
However in most smartphone use cases, that's probably not an issue.
In that particular use case, what stops you from laying an actual human hair onto your screen? I just had to take one of it, so they go there out of their own volition.
Well 1080p is nice in that it is quite widespread standard and as such eg display cloning from your phone to a desktop monitor/tv/projector should be trivial. Also you can play media content without needing to downscale (albeit this is fairly minor advantage).
Who needs pixel perfection 200 ppi beyond what the human eye can perceive? No one. But the show must go on.