I had Windows on a Lenovo laptop, and Windows update installed and/or re-enabled Lenovo system services almost every time (those included things like popups helpfully telling you that you pressed CapsLock and crap like this). I ran debloating scripts, tried fiddling with policies, etc, but Windows Update would inevitably bring those services back.

Another thing is Intel drivers. There's official Intel driver assistant software which installs latest drivers for Intel things (graphics, network, and so on). Only for Windows to re-install their "stable" outdated graphics driver next time it sees it. Again, I couldn't stop it. How hard is it for Windows to see that the driver already installed is newer already? Why even Intel cannot talk to Microsoft and decide between themselves a solution for this?