I've always considered it a benefit if they don't spend needless money and waste my battery life on rendering more pixels than I'll ever see.

My eyesight hasn't gotten better and as a teenager the 720p pixel density of the phablet called Galaxy Note 2 was already smaller than I can make out during normal use (i.e. not if I'm actively trying to see if I can make them out)

But sure, higher number sells better, no matter if this actually makes any difference to anyone

If it were just that "higher number sells better" reasoning then it wouldn't make sense the density increases had a pretty hard stop after ~2014. Same with why 8k TV hype died down but 4k TV became mainstream - it's about the genuine limit for a typical person at typical TV viewing distance unless they have an absolutely massive TV.

I always thought Samsung had a clever approach with a toggle to just render at the lower resolution if you wanted the lower rendering load. Then you still only need to develop 1 cutting edge screen with all of the latest improvements but it will please both use cases well as the cost overhead of shipping models 2 separate screens would.