Thanks for the feedback! As of now, I believe there is a playback feature mapped to R3 if im not mistaken. And you posed an interesting issue concerning how strong air blocking kind of is. Work will be done to balance out air blocking, ideas including air grabs are currently being tossed around.
As for RC, it is possible to extend combos with it even outside the corner. And for throws, the idea, at least for Dhalia and Achealis, is to score a knockdown with the option to RC and do whatever you want off of it.