I use it in a VM now and then. The only thing from the later versions i'd want to see is adding thumbnails in the file browser, being able to right click in a start menu entry to show the file/folder properties without going through explorer , being able to search apps and recent documents with win+[text] and being able to drag the taskbar buttons to reorder them.
Beyond that Windows NT's interface is just perfect. And TBH none of the above are really essential, just small quality of life things. But even without those i'd be fine.
I think modern Windows add too many little distractions with icons, notifications/popups, gadgets, etc everywhere.
Also the classic theme. I want that back. I run Win7 with the classic theme and Windows 9x/NT4 color scheme (the one with the soft light in the 3d elements, not the "Windows Classic" in 2K/XP/Vista/7 which lacks it - i had to import the colors through a reg file from NT to get them) and i like how it looks. I used Win8 and Win8.1 for a while and ran a hack that disabled theme files (which forced Windows to fallback to the classic theme) but that broke Metro/UWP apps. It wasn't an issue with Win8.x but Win10 uses UWP apps everywhere and it becomes unusable. It might sound a frivolous reason, but i reverted back to Win7 because i don't like how newer Windows look like.
Since i don't expect Microsoft to do any of the above, my long term plan is to make my own environment that looks like Windows NT 4 in Linux :-P.