The bubble is definitely an oki tool, but best used when your opponent is in the corner. I don't think I'll ever substitute 22A/B/C/D for a bubble when I'm in the middle of the stage, but you never know (I did only get one hour after all).
This is from a scrubs perspective (me) but you can use the B bubble (from sweep) into dash cancel, into IABD J.a, 5.a, 5.b, to reset your combo if your j.a hits.
Please cut me some slack it's my first time using this so i'm a bit inexperienced.