Which parts of Windows 11? Because there are still double digit different context menus in there, on
recently developed built-in applications (introduced in 8 onwards). KDE is 1000x more consistent than that and has been that way for a long time now.
It still has weirdly inconsistent margins in places but compared to the disaster that is the jumble of different UIs in Windows that's nothing.
macOS before Tahoe, sure, but now? Have you looked at the screenshots where people layered different fullscreen apps on top of each other and the rounded corners look like a stack of cards because they're all different? It's a complete disaster.
You could power all those fancy new AI datacenters with Steve's spinning skeleton.