It varies between manageable to outright ridiculous. I just finished a run of Simurgh's Strider and had to stand in the centre of the NM itself to stop it disappearing. Serket is a similar issue, with fast, hard-hitting AOEs that often don't show up.

I understand that culling is necessary, but please prioritize enemies and other party members. With most NMs it isn't a major issue, but with Strider and Serket it's causing serious problems with invisible AOEs and disappearing NMs cleaving scores of players.