Yay, an AC that complains about downvotes whilst assuming that his or hers anecdotal evidence is fact.
Indexing/Search yes they are the same where as you list them as separate, a very useful tool and on my supported machines configured as OOB never had an issue. There were issues with the older indexing service but the last time I saw issues with that was many years ago.
Notifications, really? I've never had an issue with this. Are you sure there is no 3rd party tool causing this.
Windows Defender - way better than most AV/Malware scanners at using resources.
Superfetch - yea turn this off never liked it. If you are using an SSD it is superfluous anyway.
From reading the rest of your post I assume you are just a Linux evangelist and thus don't know how to properly support different OSs. An OS is a tool. Linux has it's place so does Windows they are both good at certain things.
And if you think Linux is immune from malware, good luck with that. The fact that you talk about viruses means you do not understand the attack vectors now-a-days. I can't remember the last time I had to deal with a virus. Infections are now social engineering or trojan horses. That is a program run by the user. This can happen no matter your OS.