> Just today I upgraded the CPU fan to a new one that required to completely take apart the whole casing (because the fan has a plastic mount that needs to be on the other side of the motherboard); doing this, and putting it all together, took maybe 40 minutes? And everything restarted just perfectly afterwards. I love this machine.

This is a crazy irrelevant example. Why would you expect any other OS to act differently? CPU fans connect with a 4-pin header, it's not like switching out a major component of your system.