>>What do they expect to find that Microsoft didn't discover in testing the patch on thousands of configurations?
>
>For one, sometimes it re-enables Microsoft services that I explicitly shut down (Defender, Firewall and Update, whatever the correct names are and a couple of others I forgot the name), fortunately I learn my lesson and now I know that if my computer starts crawling the first thing I need to check are those services.

Why would it crawl when any of those three are enabled?

I could maybe see if updates were set to install during working hours (configurable), but the others are fairly trivial and work well.