Simple and to the point. Every class needs S block.
As a Shai, please...
Because playing as a succession sorc for example is pretty stressfull since you need to be moving constantly without chance of having a at least somewhat protected way to recover stamina.
I actually do not want S block on my Succession Ninja. I want the class to be forced to play a certain way, not become a Succ Kuno V2.