I tried using Vista on my Haswell machine, and it was exactly that. Eventually when I put the computer on the lock screen, I was stuck on a black screen with just a cursor, so I had to hard reset my PC. Then I started getting IRQL_NOT_LESS_OR_EQUAL blue screens after that. So now I'm back on Windows 7. You're guide to make 7 look like Vista is very thorough and nice, I just wish the taskbar was more proper. Like, when you hover over an item, the color is not blue all the time but rather the dominant color of the applications icon.
To my knowledge, Sandy Bridge was the last Intel processor line to fully support Vista. Ivy Bridge doesn't have USB 3.x drivers right? If AnX can prove Vista is fully supported on Ryzen, I might pursue that for my new build.