You, my friend, are underestimating how lazy I want to be
1-5 I am sure you can get all of those things listed to work one way or the other on windows and android. Windows and windows phone will probably be better. I am still going to have to do some sort of setup to sync my photos/notes etc even if they are pre-installed. If my photos are backed up to dropbox, I still need to log on into dropbox. I need to log one into onenote or evernote etc for my notes. These things work just by login in to my iphone and mac the first time.
On 5, you can do it on android and windows. IIRC you can even push it directly from chrome (if you are log into it) to your phone. It had something like sent to phone option. I don't know if android auto will just pick it up and go with it. I can't see why not though. It is not like Apple is perfect yet, in Carplay, I still have to touch the screen 3 times before it actually navigates to it - the first time I say yes, or go or whatever it must just take me.
You might think, why don't you just take the little bit of time and do the setup right when you get your pc/laptop or phone? (though I think on Android if you setup from the cloud it remembers everything? You shouldn't have to do any setup I would think). But I don't want to for myself, and it makes it easier for the people I have to help like my parents etc. (and on me when I help them)
6 - I haven't noticed, but now that you mentioned it, it does seem so. But I haven't played around with my windows settings yet (something you can see I don't really want to worry about any more)
7 - Sorry, I don't connect to external screens or have a mac with an HDR capable screen. But the website does say the newer models does support them. How well I don't know.
I haven't had software issues with my MBA yet so don't know about that. Although my battery is bad and will probably have to take it in if I want it replaced