Should they remove positionals at this point?

[Vaer]

That is factual wrong though. Melee DPS have uptime to consider (trying to minimize GCD loss when having to move/get away for AoEs or mechanics), oGCD weaving so as to not clip GCDs, planning out CD usage to line up with your rotation/fight mechanics/raid buffs to maximize DPS.

There are mechanics that force casters to move, and they lose 100+ potency for every GCD missed (gets pretty bad on BLM which is why they get more movement utility, smn might be the only exception but they have more stuff to keep track off), while melee lose 20-60 per GCD on a positional loss if they can still hit the boss. Creative use of utility (just like True North for melees, for casters Swiftcast, Manipulation, Dual/Triplecast etc) to keep their rotation going when they have to move.

Seiryu is mentioned but the in/out and left/right (requires slidecasting/timed casts to keep rotation going without getting smashed) is annoying for casters, too - while melee might miss out on one of two positionals with no True North but can still hit it. Actually the warp to the furthest person is supposed to punish casters as well. In first is supposed to benefit melee, and Out first is supposed to benefit casters. Coursing River pretty much ruins everyone unless a caster has utility up, and you can arms' or surecast slappy hands knockback for one or two extra GCDs.

But you say, hey bards and machinists can keep moving and shoot: currently they take a damage loss and are reliant on other jobs for their damage ceiling (dragoon, scholar really helps brd), no knockback immunities and harder time managing enmity.

The thing I will agree with is relying on the tank to not spin the boss and position properly is kinda meh but other dps jobs have their own drawbacks to it as well.

Usually if there is a lot of movement the DPS check is set very low (SeiryuEX has a light one) anyway to make up for it.