But it does come with two. Sure they not two dual-analogues, but you can play two-player Mario Kart with the pair of Joy-Cons (urgh, naming) that come with the system.
Those things do not look comfortable at all. I'll wait until the reviews come out, but it looks like I'd start cramping after 10 minutes with those.
I don't really know about that. Take a look at how mushed your hand gets just to type out a message with your thumbs on your phone.
Not if you want to get lots of controllers, though.