People who can't do AOE rotations in 70+ Content

[SnowVix]

the only place where this is actually valid is Alzadaals, where those mob spawners can be STed so they don't spawn anything, anywhere else you are a massive detriment by using ST in AOE
going from thousands of potency every GCD on a big pull to like 300 potency a GCD is not worth the tank taking damage from 1 less mob

also the Roilers in Amaurot, since until they die, the healer will have debuffed healing and that could also pose issues.

[Rein_eon_Osborne]

also the Roilers in Amaurot, since until they die, the healer will have debuffed healing and that could also pose issues.

Those roilers only debuffs healing magic, doesn't affect healing amount coming from oGCDs which is where most of their healing comes from. Even when the healer in question is a WHM, they're pretty much still negligible so long everybody sticks to their AoE rotations.

EDIT: I have only seen this became an actual issue when I’ve been paired with that one random BRD who told the party to focus the roiler because it makes my life (SCH) harder if they’re ‘left alive too long.’ Surely enough by doing that, the tank took more damage in long run due to prolonged overall pack lifespan. I just told them to AoE like monkey after first boss then suddenly we’re clearing packs twice as fast. A magic perhaps!? Yeah no. Just slapping the ground like usual. No magic tricks.

If folks are worried about certain enemy needing to die first then the best thing they could do is to target that enemy to ensure all auto attacks & AoE with damage fall offs still hit harder. Bonus point if they know how to use their Low Blow/Leg Sweep/Interject/Head Graze appropriately.