Improved UI, absolutely. Perhaps later on some sort of custom soundtrack support. Steaming apps would be great for those that only own the a switch out of the home console and don't already have a smart tv or some other source for steaming services. Streaming apps aren't that necessary, though. If you really want that stuff there's pretty cheap HDMI dongles out there like Chromecast.
Every else mentioned, the system really doesn't need. It's not gonna browse the internet better than a modern smartphone so why bother? Also, isn't all the social crap already going to be handled by a phone app later on? I think it's a smart move on nintendo's part to keep that stuff on phones.
EDIT: I forgot about cloud storage for saves. That one is always welcomed.
4 ≈ One
