What amazes me, having worked with W10 for years now, is how slow and unresponsive it is. For example, I got a laptop returned to me and went to put it on the network as a matter of course to get any missed updates. The user was still logged into the machine. They couldn't be bothered to turn it off when it was returned. I did Restart and waited. And waited. And waited. The system sat at Restarting until I finally killed the power. I've had other systems which sat at Restarting for so long I had to rip the battery out to break it out of its hung state.

And this is routine for W10. It's always stuck at "Preparing" to do something, at "Updating", at doing who the hell knows what. It never does anything until you put a gun to its head. Even logging into a machine for the first time is tediously long.