I really doubt that torpid torment was designed to remove air shield. They just happen to not stack because it's a focus damage debuff and air shield has a focus transfer rate mod. In any case, it does also remove chaotic feedback (for the same reason) regardless of whatever the intended effect is. That makes some builds that were already very limited even more limited, in addition to the effect it has on air shield users.. Imo this is the kind of thing that is more suited for bosses. There are lots of boss fights that could be spiced up by giving the boss the power to drop all player shielding spells or just mass dispel. Otoh, giving ordinary fodder mages the ability to drop air shield and chaotic feedback is a super random thing to do, and spectacularly annoying if you happen to use either of those skills. Buff management isn't really my idea of a fun challenge, and SotA already has a ton of that anyway. Doesn't really make much difference to me whose idea it was.