... then they go back to telling you "I've never had a problem with it."
I use Windows 10. I support it professionally. The underlying system is good. And then someone at Microsoft decided to completely fill all of those kernel upgrades, with a gigantic pile of spyware, adware, and useless crap. (4 GB+ of Windows Store videogames?!)
One of my laptops is a "windows 10 ready" work laptop with a 5400 RPM hard drive. Between defender, indexing, telemetry, and app compatibility scans, it takes over 60 seconds to get to desktop. If you load the task manager, the disk usage is 100% for hours. And any time Windows decides to install or compile something (without warning or even a notification, like rebuilding .NET) the entire computer becomes a useless brick. I used to be able to make the machine functional by turning off unnecessary, bloated services like Defender and Telemetry. Except every Windows Creators update they not only reset my settings, its disable Classic Shell, UNINSTALLS Core Temp and a WindowsGadgets re-enabling tool because they're "not compatible" (even though they work fine), and... they change the menus so that it's harder to find the button to disable Defender, and they make it harder (if not impossible) through Group Policy changes to disable those very same, taxing, services.
Try this: Install Windows 10, upgraded from 7/8/old-10. See Windows.old on your C:\? That's your old windows copy. Try to delete it. After all, it's useless right?--and takes over 20GB. Nope. Sorry. You don't have permission to delete it. That's right. Your own hard drive you don't have permission to touch. And, laughably, Windows will tell me "You're running out of HDD space, want to delete the old folder?", I say "Yes." Then nothing happens and the message appears again.
I tried taking "ownership", used admin account, I tried changing permissions. Nothing. A professional windows IT support employee should not have to look up countless articles TO DELETE A FREAKING DIRECTORY. Even after I took "complete" ownership of all that, many files still didn't set, and I couldn't delete the whole thing.
I'm half tempted to boot into a Linux Live USB and delete it by force. But then I realize, "I'm going to download an ISO for another OS, burn it to a USB, then shut down my machine and reboot it... JUST TO DELETE A FOLDER?!"
Oh, and this is Enterprise edition. So I'm running the edition that everyone says "if you care about tuning Windows, you should have already bought Enterprise." Thanks for that lie.