Dawntrail's mediatour dungeon was already cleared without healers.

[Loggos]

Practically any dungeon in the game can be cleared day 1 without a healer, especially with a warrior tanking

Yes and that's the problem. Even in normal content each class should have enough of a purpose to not be replaced so very easily. That is the point of the trinity.
There is a clear discrepancy between the state of healers and that of other roles that should not exist.
It being already possible in EW doesn't make it better. It makes it worse.

Talking about WAR in particular, no job should be so crazily powerful on all fronts, damage, healing and mit, that they trivialise an entire role.

It's not like they really struggled. He even dragged skills onto his hotbar during boss fights without it causing any major hiccups despite such shenanigans.

This being media tour footage of all things is making healers look like a fool.