I'm not sure what "not exactly true" means, it's my personal experience of trying to run Windows 10 on my MBP. Many of the video tools I use regularly (for encoding, subtitle creation and editing, authoring, muxing, etc) are either broken or look bad. I understand that may not be mainstream use, but it certainly isn't esoteric either. You say browsers, but last I remember, Chrome didn't really support it. Now I am on Firefox, so it's proper, but that's not what most people use. Adobe software, as you said, is notorious at supporting scale. That's not esoteric either.

Chrome's hidpi support has been acceptable on Windows since about 2015. It's still not absolutely perfect (there are issues with 1px black bars when resizing Windows), but it's completely usable.