At least with many characters it was possible to make the first hit of 112124 to whiff by crouching. Can't tell you exactly what characters because it is cumbersome to find out whose hitbox shrinks when crouching.
The same thing happens with Erron Black, too often they let themselves be bullied by 21122; probably because of the fear to f13.
It's not about that, you have to be neutral crouching to make the first hit whiff, and it's not like you can punish it on reaction. You basically have to be neutral crouching and mashing a poke/uppercut. It's not like you netural crouch, see the hit whiff, then full combo or interrupt or whatever, because by then the second hit would have made contact with you.
So yeah, people weren't doing this because that means you're letting go of block and it's risky.
Anyway, if people want to try to interrupt this by all means, mix up your pressure and go for b321 after a 112124~ex hat spin. If they're trying to interrupt they'll eat the hit and you can confirm it into a full combo.
Of course they could try to armor as well but then that's also risky because if you do decide to do another 112124 they'll get hit.
So this is less autopilot but actually opens up more possibilities, which is fine by me.