I think they made it like that as a balance precaution. Beforehand we could stay in the Rif for a limited time, cost energy to cast, had cast time and could only banish 1 by 1. Now we can stay in the Rif indefinetly, has no cast time, no energy cost and can banish groups. A strategy I've been using is: before sending anything to the Rif, use Stasis. Banish as many as you'd like. Enter and kill them. Even before using Cataclysm I've been using Stais first because that stagger