I have shared a computer with people, but we definitely don't want our stuff open at the same time. I would find that confusing and a bit of a violation of privacy. So that leaves me (and most people I assume) just trying to imagine what it is that you are not happy with. And I honestly don't know what you are talking about when you say 'regular shortcut'. As far as I know, there is only one kind of shortcut in windows. It's a icon that runs a command of your choice, with an icon of your choice, placed in a location of your choice (any folder, any part of the start menu, or somewhere on the taskbar). So when you talk about shortcuts not being the regular one, I don't know what you mean.
But look, if you say it's bad for your use-case - I believe you. When I said that it was a stretch to blame Firefox, I didn't mean it was a non-issue. What I had in mind was that your primary complaint seems to be about what Windows is doing rather than what Firefox is doing. In any case, like I said before: if it isn't doing what you need then it makes sense to look elsewhere. Good luck to you.
Brand integration definitely is not neutral. Functionality to make it smooth and easy interact with nazi-central lends Nintendo's credibility to that platform. It's not a neutral feature.