Windows architecture is great. the WinAPI is better documented and more comprehensive than anything on Linux or Mac.
There are so many other issues. - The file explorer gets slower and more broken with each update. context menus randomly don't show, or take literally 30 seconds to load. - The renderer crashes randomly once a week (it's not a huge issue, but the screen goes black for 10 seconds or so) - the settings dialog is bad. goes through like 5 different layers of Windows generations and recently makes the old dialogs hard to find but doesn't offer adequate replacements (looking at network and sound) - and much more...