By YOUR Street Fighter I assume you mean SF4, considering how integral the low frame rate had been to playing SF at a high level since the beginning. But thats really off topic since what you describe only really exists in sprite based fighters...
I mean thats still low framerate compared to any polygonal fighter. GG's thing is to trick you into thinking its 2d until it changes perspective. The framerate isnt low from what ive seen in videos, the character animations are just made to look the part. Theres a lot of design space to play with that graphical style in. Its certainly more ripe for use than when the shitty old style of "cel-shaded" graphics was all the rage during the last couple of gens.
Both I and the first person have been talking about the graphical style/cel shading but you are bringing up and seizing on the GG characters' animations. The original poster even said "1080p representation of Alpha's sprites" There is no reason at all that the animation has to be done like GG. Its a 3d model, they can animate it exactly how they want. They are two separate elements of the game.
