Ye I agree, it can only be used to mix-up your game. I don't have the exact dmg but I believe CH3A, 2A+B, 1B (without tech) is about the same dmg CH3A, 33B does. 1B being the only thing that hits otg if they don't tech.
It is pretty situational, but I took a lot of people off guard while doing that, even confirmed players.
And then folks don't have to know that if they don't tech, they can guard pretty much anything (except 1B) so you can apply some big damage on them thanks to their fear of tech traps.
So I mix it up with other kind of tech traps (the ones Belial posted for example) and normal combos.
By the way, I did all the tests on Nightmare (and it worked a lot against Xianghua in versus). Some of those traps are rather hard to get (like k:B on left tech). Overall, the timings are that you have to do them very very fast.
It is pretty situational, but I took a lot of people off guard while doing that, even confirmed players.
And then folks don't have to know that if they don't tech, they can guard pretty much anything (except 1B) so you can apply some big damage on them thanks to their fear of tech traps.
So I mix it up with other kind of tech traps (the ones Belial posted for example) and normal combos.
By the way, I did all the tests on Nightmare (and it worked a lot against Xianghua in versus). Some of those traps are rather hard to get (like k:B on left tech). Overall, the timings are that you have to do them very very fast.