One stun into launch doesn't do a whole lot of damage on average.
Ayane can get 50-60+ damage on a consistent basis just from stun > launch, that's really good. It's one of the few (but many) reasons why this character is really good. She also has guaranteed force tech at "every launch height". One stun into launch for force tech on average is more than enough for her to keep up momentum throughout the round/match.
If I stun you "once", and you hold high/mid or block afterward, I have the option to throw you with 64H+P.
64H+P > 4P+K > BT4P > BTPP6P2K is a guaranteed force tech with 50+ damage. Which leads into a nasty 50/50 (3P, 66KK4, 664H+P) mixup that you're not getting away from. That's all just from one guess.
Ayane has the luxury of not being forced to use the stun threshold so much to get decent damage. But she sure can go for it. Hell, she can get force tech with 8KK (8K is a normal hit launcher and a hi crush) just for hi crushing you.