Healer strike is basically the community of veteran healers that are fed up with the devs essentially ignoring healers. Every expansion has been the same song and dance.

Promises of increased healing checks but not actually doing it?
Check.

Healing being boring but there's nothing to heal?
Check.

AST/SCH either being broken or weak at the start of the launch only for the devs to over buff them because of low popularity?
Check.

WHM being left untouched and left to rot because the devs see high popularity and force the classic healing job into the box of being the beginner healer?
Check.

Devs not admitting that healers in the game don't just heal and actually contribute to doing damage but giving redundant healing abilities while not adding anything else meaningful to healer dps rotation?
Check.

People who don't play the role or healbot purists dying on the hill that healers should just heal instead of doing damage when said healing is so boring and easily dealt with and smashing the dps spam (and dot every 30s) 80% of the fight?
Double check.

I don't completely agree with the strike but I definitely understand the frustration over being ignored for several expansions.

Another double standard is that people complain about dps queues being too long because tanks and healers dropping their roles to be dps because things are more interesting on that side. The devs put zero effort in job changes as it is and the fact they have gone on record to say that making a new healer or tank is so difficult when dps jobs are starting to see the effects of homogenization that tanks and healers have been subjected to since Stormblood.

SGE is fine for now since it released last expansion. Give it some time and I imagine the devs will find a way to ruin it somehow.