Likewise NPCs were never allowed to SCB tank either - That to me highlighted a potential balancing issue. Strange how that's been (or his being) addressed don't you think?
And the point being made is NPCs are not allowed to multi-chaff. ie: You will not see a chaff shield raised for a minute or two by an NPC. Can you imagine if they did this how the community would react, and what questions it might raise?
You keep saying these things with zero proof. They do use SCBs, and they use them one after another, just like chaff.
Your claim they are not allowed to use certain tactics is just plain made up.
The fact that you don't see them does not mean it does not happen. Not many NPCs do it, but they do exist.