We've had conversations in other threads on the very subject of why the devs expect healer and tank DPS to be minimal, yet the damage output of the actual damage dealing focussed jobs isn't "good enough" for most content.

These conversations always end up going in circles, (Why is WAR so attack focussed? Why are heals tuned so high?) and the last one deteriorated as it included extremely parse happy players, which is a ToS violation and implied toxicity magnet.

My thoughts are more that the devs abhor the speedrunning meta of the game, and since Stormblood, they have been actively working to break the community of it. It's not working. Simultaneously, they want us to use our whole skillset.

So, who knows.