I welcome smarter AI outsmarting the player's tactics (like not using Yell/Aimed Shot snipers while you're in Stasis, invulnerable to all that; or casting Distortion), but I think debuffs reducing Stasis duration and even piercing it is too much. Those debuffs won't tick down which means you'll still have a massive disadvantage after it runs out.
Stasis already needs almost 2 levels worth of skill points and a 20% max HP hit for you to be able to use it. The cost is also really high, as is the cooldown. Why punish you further for using the last, most powerful spell in TM? It's not even that good by itself, you need to pair it up with an alpha strike build to take advantage of it because NPCs can't spend all their arsenal within two turns.