Some users are required to use Windows. It could be the professional software for work only runs on Windows. Or system administrator are forced to use it in their IT environment. You don’t want it to get worse, as it will be more pain for them. You want the alternatives to be better, easy to get, (like every PC comes with a menu with what OS do you want to install). Full software support for everything would be a dream.
Some scenarios are useful, but the AI has to read it all to find that. It just need to know as much as possible in order to build a profile.
The only problem is that it is not limited to only you that can read the profile. You have no control of the data is stored.