Later? You mean after it fully airs.. right?
There's no fun in that. I want to watch with the world. Join the weekly discussions. Enjoy the memes. What's the use of adding it after the entire world has already watched it. By then all new Winter anime lineup will be ready. And we are supposed to be watching Fall anime?
Even if they add it weekly on Netflix, it'll most probably be 1-2 weeks delayed (just like Kaguya-sama & Fire Force).