21122 ex sand grenade is still a true blockstring. Cancelling into anything that wasnt the last hit of 21122 has always been armorable which you continuously did in the video.
that is also some serious downplaying of sos3. That does ridiculous chip, can armor break some moves on oki as well or even off 21122xxsos3. It has the gap, but its necessary since its a pretty solid move.
Lastly, you act like every Kano player will be stuffing your d4 with low parry. You're in a controlled enviroment, so unless you become ridiculously predictable with d4s, it won't happen all the time as shown in the video. I can see the 21122 whiff parry, but you shouldn't just throw it out without proper spacing.
Erron is without a doubt worse off with those beta changes, but this has downplaying written all over it.