I feel like there's a core misunderstanding here. WAR is not the tank replacing healers, I suggest you actually watch the vods rather than headline read and make assumptions.
I'll grab them for you,
Here's FRU:
https://www.youtube.com/watch?v=1uvYcjbGkYo
Their tank comp is:
PLD, PLD, PLD, PLD
TOP:
https://www.youtube.com/watch?v=k65bhdogQKw
Their tank comp is:
PLD, PLD, WAR
I recall a vod existed at one point of P12S also being cleared healerless, its comp also was PLD stacking. WAR shows up now and then but its never the central point.
Do not misunderstand me, WAR's healing tools are strong, but WAR really can't replace healers.
It requires a targetable enemy to heal someone else, Nascent Flash doesn't work otherwise. It flat out just doesn't offer the mitigation to survive things, while PLD does with Cover, Passage, and can even spot heal people in a pinch with Clemency. and in this case, yes I do believe these are just incredibly skilled players pushing
Paladin to its limits, as well as highly skilled players on supportive DPS jobs that can pick up the slack.