It is clear that the dev philosophy isn't working and healers are becoming increasingly rare.
White Mage, Sage and Warrior are tied for the most popular jobs in all of FFXIV right now (although Dark Knight takes Warrior's place in raids specifically).

In high-end content, White Mage is the most popular job in all of FFXIV, more than tanks and DPS, it has been for a long time and it's not even close. So this just isn't true!

1. Lack of engaging gameplay from constant Glare/Broil/Malefic/Dosis spam. There is no skill ceiling or depth
Kinda is because a lot of healers spam their heals and shields when they can get away with doing DPS and weaving abilities instead. The belief that Scholar is meant to use Adlo every 5 seconds is prevalent among many players judging by how much I see them apply it to me. The gameplay is mostly engaging when there is a lot to heal ie. an undergeared tank or a leveling dungeon, both of which I healed recently.

-Pandaemonium 1 normal was completed SOLO by 3 of the 4 tanks https://youtu.be/fFcZCEny4x4
-Pandaemonium 1 and 2 SAVAGE was completed WITHOUT healers when current https://www.youtube.com/watch?v=JRbvZJ-EU0U
So SE increased the amount of work for healers in Abyssos which seems to have been good.