The Switch OS is simplistic and beautiful, it doesn't need "fluff", the Xbox/PS OS's are hideous and full of bloat.
The Switch is the best system for playing games there is. Nothing in your way of getting in and out of your game quickly, nothing in the way of notifications, nothing in the way of superfluous things like achievements.
What a crazy concept, a gaming console that basically focuses on that aspect...
Yes, it would be better if gaming consoles just focused on that. Roku/FireStick/etc are much better for streaming services, phones/pc/etc are much better for social media interactions and basic internet browsing. Why waste time and resources on those functions, if you want people to be always engaged with your device then give them what they want, the best gaming possible.