I suppose if you give a generous take on what "very high DPI" is this would be easily agreeable e.g. some phones pushing 600 DPI but for the devices in question they ship with ~160 DPI displays though and that's nowhere near needing a magnifying glass to distinguish more clarity.

It does suck some power though, same with high refresh. I used to have my laptop flip between 4k 200% DPI and 1080p 100% DPI based on whether I was plugged in. Usually ran games at 1080p. Important to use nearest neighbor scaling in that situation though or it'll get blurry.