I wouldn't remove either.
I would make positionals more job-specific as mentioned in my previous post. SAM (front), MNK (front/flanking), DRG (flanking), RPR (5 yalms), NIN (rear), VPR (rear/flanking). Mostly to remove senseless samey positional dancing.
And I would also keep DoTs, with particular emphasis on returning them as a major component to key job fantasy damage dealing: BRD, SGE/SCH (but not both), DRK (is almost the DoT tank and needs more identity), VPR (flavor begs for it). Of the casters, I would either make RDM or SMN a DoT mage, probably SMN to recapture some of the lost SCH warlock identity.
I think pushing the idea that we need to sacrifice one or the other is already poor framing.