Sycraft
The fuss is mostly just silly people. It is partially people who just dislike change, which is a fairly normal human thing. The new OS is different so they don't like it by default, without trying it. New = bad and all that. It is also partially zealots who are trying to hate on MS. Every time Windows comes out there are some Linux and Mac heads around the web, some of them tech journalists, who spin the FUD train in to high gear to try and make MS look bad. Of course some people repeat their stuff without knowing any better.
It'll all settle down soon, since as you say there's no big deal. 10 is another OS, nothing special.
Hang on..
I much prefer Linux more than anything. I don't run Apple but I don't have anything against it. I also run Windows 8.1 and 10 which is fine. I really don't understand OS wars as much as I don't understand DAW wars, other than maybe poking for fun. They are all tools.
I like Win10 but it's not going to upgrade my DAW environment until at least hardware compatibility is sorted and bugs get ironed out. That normally takes six months. That is fine by me,you aren't going to catch me moaning about it.
I am not zealotted against any particular OS but I have my preferences. I will be happy to run Win10 across all my machines eventually I only have one OS partition to do a Win10 upgrade now.
My dream though is to be able to run a DAW such as Sonar on Linux and dump Windows.