For me, it's more like... I feel that healers having this added pressure is a poison that results in healers having a "complexity tax" in the same way that other jobs have things like mobility tax, utility tax, and so on. Physical ranged DPS have low DPS because they can attack from anywhere without cast times. Healers have low complexity because there is an inherent pressure on them to always do mechanics correctly or risk getting KOed and starving the rest of the team of their sustain, which traditionally results in certain doom of the party if they cannot finish the fight before they take more damage than they can otherwise withstand. So from the designer's perspective, making the healers easier to perform makes them less likely to make mistakes or more likely to pay attention to a fight's mechanics.
And taxes like that aren't a bad thing in general, but the FFXIV designers don't seem to understand the concept of restraint when it comes to taxes. Every tax is so unnecessarily steep, far beyond what any job deserves in contrast to what it's being taxed on. Like I think Red Mage's raise is a really great piece of utility that can potentially save a part a lot of time saving a run from failure, and that is worth a tax on DPS, but not to a scale of nearly 2000 DPS.
So I for one would gladly take whatever consequences come with unleashing the utility of Phoenix Downs if that means healers can have their complexity tax significantly lifted.