There's an old "ha ha, only serious" joke. If you go to a Linux forum and ask for help fixing your WiFi driver, everyone will ignore you. If, instead, you say "Linux sucks, you can't even get a f&$ing WiFi driver working!" thousands of people will solve the problem for you.*

This is 100% accurate. There is no better way to get assistance with HiDPI tweaking on a Linux desktop than to go onto a subreddit and bash your DE of choice, complaining about its lack of HiDPI support.