I was looking at an old academic article the other day and there were screenshots of plots from Mac OS 7. It was refreshing to see minimal white window bars with clear contrast around the controls and labels, not to mention less distraction from the content. It would be nice if Microsoft provided a minimal contrast theme like this, rather than the material design which dominates everything these days. Although any theme customisation would be nice in Windows 11 in comparison to Windows 10 which stripped customisation options considerably.
I guess the best feature remains WSL, and the only function of Windows will be to install another operating system!