I've been primarily a Windows Admin for 20+ years. Cut my teeth on NT 4.0 back in the day. That's 30 years of Windows for those keeping track. Windows 7 and 10 were two of the best OS's Microsoft has put out (though far from perfect). XP, Vista and 8 were awful, but pale in comparison to just how bad 11 is. Out of the box it's not an OS...it's an advertising platform.
I only recently returned to workstation work after years of being mostly server side. It takes hours to get 11 prepped and ready for users. And don't even get me started on the "Classic" vs "New" Outlook situation

. I got fed up early with 11 and purged all the Windows laptops and desktops from my home network and switched to Macs. When the professional workforce supporting your products don't even want to use them during their non-working hours...there is a problem.
My biggest complaint is how every part of the OS has become more and more incoherent for professionals trying to use or support it. Remember back where there was a big push to move from Control Panel to Settings? How are we coming on that? Oh right, it's 2026 and configuration options are still spread out over hell's half acre. Want to create a shortcut? Get ready to click half a dozen times instead of twice

. Meanwhile I can hand a mac to someone who hasn't touched an apple product in 20 years and for the most part they'll recognize the OS. More than anything Microsoft needs to stop chasing every new shiny object when it comes to the UI and prioritize consistency. If basic functionality stays the same from version to the next fine. But 11 has shit all over that idea at pretty much every turn (the centered start menu is the dumbest thing since BOB and I'll die on that hill).