There have been 1440p screens in smartphones/phablets for quite a while now.
yeah. Still not really seeing a reason. I've used 5.5" 1080p phones (iphone 6+), currently using a 1440p moto x pure.
Don't feel like the resolution improves my day to day usage and the higher resolution hurts game performance (wish other companies besides samsung offer 1080p gaming mode thing).