What you Samurai players just suffered in the unfortunate loss of Kaiten is a perfect example of what healers have suffered through for 6 years- losing core pieces of identity and job design for no return and with yoshida going "just try it first" and then in all likelihood not reverting it. Or maybe he will as you are a dps.

Lets go through the most important concepts in healing.

1. The goal of healers is to minimise healing and maximise dps uptime and contribute to clearing the encounter.
As you get better at your job as a dps player, you deal more damage. Likewise for tanks as you get better, you deal more damage. For some inexplicable reason the developers and some sylphies/curebots seem to think that "Better healing=More healing" when in fact "Better healing=more efficient healing"

2. Incoming damage is so low and tank/dps restoration is so high, content is constantly cleared without healers
You have all seen how tanks (bar drk) can do current savage content, e4s at level, ucob and more without healers. The problem is Yoshida refuses to up the amount of healing required by the party in spite of this increasing amount of duties that dont require healers
Thus: healers have very little healing, but they still want to contribute. So they deal dps like the tanks and dps.Because healing is so low, almost every duty does not require GCD healing and so 70-100% of gcds are dps

3. They have taken away all our damage options and Kaiten equivalents- buttons that make the jobs feel unique and fun to use. Remember how much gcd we use on dps but we only have glare/broil/malefic/dosis to use for most of it
Selene and nocturnal sect were removed with nothing to replace them. This is like removing Ice phase from blm or midare from samurai.
Astro's cards, Scholars dots+bane+shadowflare. eye for an eye, aero 3, all gone
Imagine if yoshida removed all your buttons except Hakaze, Higenbaten and Fuga for ALL of your gameplay. Thats what healers have suffered through for years. Then imagine you brought this up with yoshida and he told you to "Go play ultimate". You'd be furious. Thats why healers are furious.
4. Healing has an upper limit to how much can be done. Dps can always go higher. So all these extra heals we keep being given are worthless.

Overhealing is a waste of resources. Damage always contributes

5. None of the dev team plays healers. The one tester for healers they had they kicked out of the testing group because he was starting to heal extremes and normal raids, which I remind you, can be cleared without healers.
This means none of the healers are tested by average players who deal damage during the long stretches they don't need to heal.
Back in stormblood, Yoshida put out a statement saying nobody was taking white mage because they were left to do all the healing. Not only was this factually incorrect and proved with data, he ignored the real reason Whm was never played was because they took away 12 of its buttons and had to cross class 7 back

6. Healers have been demanding change for 6 years and questions are either ignored or dismissed repeatedly

Healers ultimately want the same thing as everyone else: They want to have fun with their own unique playstyles and identities and contribute to damage while assuming their other responsibility.

But healing is so low and our damage options have been watered down to the barest neccessity that healers are constantly upset. New players enter the role and leave out of boredom while veterans are driven away. Those that remain are the rare 1% or tend to be very low skilled.

Astrologians want their cards and time magic back. Scholars want Selene back and their dots. White mage wants for too much to be written here and Sage wants better toxikon and more dps options since ironically they have the least for the supposed dps healer.

and ALL healers want more healing to be required so they actually have a place in duties.
AND YOSHIDA REFUSES TO GIVE ANY OF IT