Oh I should also add that I haven't ever had any of the DPI issues the parent's parent is referencing. The only problem with multiple display DPI in Windows 10 is the shockingly bad fuzz you get on your secondary display from the thing being rendered either smaller or larger than normal (depending on whether the 4k is your primary or secondary) and then scaled up or down to fit the monitor.

After it goes to sleep, then I wake it up all open Windows have been resized into a tiny part of the screen and scaling goes weird.

https://duckduckgo.com/?q=windows+4k+monitor+resize+after+sl...

Terrible.

Having said that on macOS my external 5K LG monitor is causing complete system crashes now and again :(

I wish Windows based scaling on DPI instead of resolution, the system seems to be aware of both. On a more general level, I wish there was any hope of passing feedback to Microsoft/Apple/etc.

I'm a fan of no DPI scaling (100%) at 4K, at least on my 27" monitor. It takes 2-3 months of getting used to, but once your brain and eyes adapt, significantly lower dot pitches become completely unusable. The only thing I change is bumping up my terminal or editor's default font size a tad.

That said, I'm not sure how people with 24" 4K monitors do it without DPI scaling. I'd probably even prefer 30" myself.

Correction/clarification: significantly higher* dot pitches, as in lower pixel density. "Completely unusable" was meant in the sense of how it'd feel to return to 800x600 after being accustomed to 1080p. 4K is four times 1080p, so it's roughly comparable.

It wasn't my intention to offend anyone with poor eyesight, or suggest that people ruin theirs. Just that it's possible to get used to really low (dense) dot pitches, and once you do it's simultaneously really enjoyable and weird at the same time.