We need to do something about Tanks and Outgoing Damage from Bosses

[Sunhwapark]

the times SE tried to upscale the difficulty of casual contents and made healers to heal and they actively abandoned duty especially when they saw a tank with a sprout next to their head.

Nah, this was just done by people that didn't primarily play healer classes, things where you can't let eos/selene carry you always seem to get complaints. The actual issues healers having were tied to WHM during SB with the archaic 1.0 version of lillies they implemented and gaslit the players that the system was "fine" only to backtrack and rework them. wasting resources to fish for lily procs ? Really ? The only other thing besides that was the very heavy reliance on barrier/regen co-healers, but nowadays it has been homogenised to a state where all healers can now do a lot of regen work for free.

Believe it or not in Shb SE tried again and the healers complained again for having to heal and wall-to-wall pulls so SE gave up and toned down everything after Amaurot

You are misinformed, the other healers were *mostly* okay - almost tolerable, however AST was in the gutter during the first month of ShB release due to being so numerically under tuned that people would avoid going into roulettes with them due to them struggling so hard even with a geared tank kitchen sinking, only made worse of course if paired with a DRK, they did eventually fix it but it was on the same day that savage released, so slots were locking them out only for a little bit, but generally didn't happen often since people will generally take literally any healers they can get instead of waiting in PF for 10 hours.

they also complained about the old DRK for no self sustain and uncomfortable to heal so now every tank has sustain. Kinda surprised how the the healers are striking now.

You must only be speaking from ShB and beyond, even though having no way to self heal during drk's Walking Dead timer was a major complaint throughout the classes existence, Dark Arts + Abyssal Drain was pretty much what WAR can do today with Bloodwhetting or whatever it's called.