Ever since the change to Weakness and Brink of Death in 4.0 from reducing all main stats by 15% / 30% to reducing everything but Vitality by 25% / 50% I had the feeling that healers get punished a bit unfairly here.
I get why they changed it - people kept dying because of reduced max health - but cutting down the Mind stat on top of losing all your ressources is a bit much.
Especially in Brink of Death status your heals are basically non existent anymore. And without ressources you also can't spam them to compensate for the reduced potency.
In the end other players will die because the healer simply can't keep up anymore.
When a tank or DD dies they will lose damage potential. But that can be better compensated by the other DDs, healer and tank (depending on party size of course). One could argue a tank does get punished less than a DD (because the ability to tank properly is not affected by a death at all and losing dps on a tank is not as bad as losing it on a DD), while a healer gets punished more.
And there is only one other healer to compensate - if at all.
Plus when they made these changes back in 4.0 we still had a TP gauge. They removed it in 5.0 and since then physical jobs also get punished less than magical jobs.
Maybe a complete rework of how a death is handled is necessary.
However:
Since healers damage now also scales from the Mind stat I would suggest to simply change the Weakness and Brink of Death debuff to a simple "Reduce dealt damage by X%" debuff.
Healers get punished enough by losing their ressources and damage potential.
Also the whole idea of changing it back in 4.0 was so people would not keep dying because of a death. But there is a good chance they will die when the healer can't heal properly anymore.
With a 50% healing debuff you can just keep lying on the floor.