As far i know in Overwatch there is no healer, only support and if you play like a healer you are a bad player. IN OW you have Support and if you are pedantic there is also flex but does not matter for the argument.

In FF14 i have the feeling we have a extreme DPS favored encounter design but the classes (WHM, SGE, SCH, AST) are build with "healer" idea in mind. The healer idea is simply put a class that extemly focused on healing and keeping the party alive while the DPS department is nonexistent or only to a extreme minimalstic degree there.
SO we have "the healer idea" as a job, while the encounter is DPS favored which leads to 98% Dosis cast in a full extreme fight and this is just bad design. But sadly so it seems on a fundamental level that we just can't make healer class to supporters. The encounter design needs a change first... (while they are at it : Kill the 2 minute meta pls).