Wow! Snippy today aren't we? I'll try to address your concerns in order.
1. When you remember to simply flick your wrist instead of doing a full arm turn you can get very quick angled shots off.
2. only for the initial part of the punch. At the tail end of the punch, right before it comes back the angle of the joycon you haven't punched controls what direction you move in. You can even get a last second dash if you see a punch coming.
3. Let me give you this quick scenario:
Someone is in close/mid range and is going to grab you. a punch would break their grab yes and then you can throw another punch to counter. HOWEVER, if you remember point number 2, it's probable they could actually get out of the way of the counter. BUT! If you were to have the boomerang similar type, you would be able to do both at the same time, flick your wrist with the boomerang type hand so it doesnt hit the grab too, ensuring a punish in to what ever you want. (Watch out with fighters with super armor)
There's also times where you can get into a punch off and you are both throwing punches close up, you can break that in your favor by doging a punch, then punching the follow up that the opponent throws out to catch your dodge and punch with your other hand at the same time to to catch other guy. He might punch to counter your punch, which is why you would angle it to avoid their punch so you can hit them first. (Again this won't work on fighters with super armor so approach those guys with caution.)