IME it works fine on Intel iGPUs, too. I even use multiple ratios with no issue (constant 125% on the laptop, 100% on an external screen and 200% on a different screen at work).

Contrary to Windows, this also works well when hotplugging screens. Menus don't end up a blurry mess, and apps seem to work fine. On Windows, even some 1st-party apps are borked (task manager comes to mind).