Ideally I'd want 5K displays (I'm used to the iMac 5K) but it seems that LG's UltraFine is the only real option and the rest of the industry has settled on 4K/UHD at 27 inches, which results in a) limited screen real estate due to an effective resolution of 1080p at 2x scaling and b) slightly less pixel density.
I maybe fine with b) but both issues considered I'm seriously wondering why UHD displays at 27" are so popular - it seems like a subpar and regretful combination. Are my worries unwarranted?