...if a few random stuns/knockbacks are your main (only?) issues in faceroll/spammed instances - you must be in a very pro group. In which case it's questionable why you even have people like that with you, who play SMN and just let their pets do whatever they want. Similarly, if actual and properly geared tanks have trouble maintaining enmity against Titan-Egi (especially if that Egi is on Sic!), it might not be the SMN's fault, regardless of how they should not exactly do certain duties with Titan-Egi summoned. Just saying.

I don't think people doing FCOB (where I imagine these might matter) commit these "grave mistakes"...