It feels super nice on iPad and if you're running a Catalyst app or such on macOS that's designed for it, it could be cool to be able to toggle between the cursors.
I would agree on the macOS point right now, but big surs design style leans heavily towards a style that would probably work quite well with it.
I would only want it as an option, I would in no way want it to be the only option. I just think the different cursor types could benefit different types of applications.
If there was any trackpad to pull that off its the macbook trackpads.