So ask them instead of making assumptions about their feelings.
It's not an argument that more healers exist. It's pointing out that for the most part, it looks like those who have healed in the past are continuing to heal. As much as some want the general community to think that healers are giving up healing, we've got nothing to substantiate that outside of some cherry picked screenshots and others have turned around to share their cherry picked screenshots that show different.
Healers have always been one of the hardest roles to fill in MMORPGs and that's not because of job design. Most players have no interest in the role. They want to be the damage dealers watching huge damage numbers flash across their screen and feeling like superhero because they're bringing down the big bad. Healers rarely get those superhero moments. It's a rare fight that's designed to put the healers front and center. I remember all my years of raiding in WoW and the only two fights like that I can think of were Dreamweaver (which DPS generally hated because they spent the fight killing trash) and Tsulong.
The healer voids in PF are getting noticed more this year because players are paying more attention after the strike publicity. In game, I've been hearing more comments about healers not healing in dungeons than I have heard comments about people having a hard time finding a healer to fill their PF. If it was that much of a problem in PF, I would think there would be a lot more players complaining.
I don't have all the answers. I have my observations and experience from almost 2 decades of playing MMORPGs, and not just FFXIV. There are the things I've learned from reading developer blogs and interviews. And like everyone else here, I have my opinions about what is good, what is bad, and what simply is. I try to be practical and realistic in my comments, putting aside my personal feelings as appropriate to see the greater picture.
So far, I'm not seeing anything out of the ordinary compared to prior expansions so I have no reason to believe that there are a lot of healers participating in the strike, whether by quitting the game or switching to play only tank/DPS jobs.
I also haven't said that the developers know everything and always make the right decisions. I've said multiple times that I do see problems with healing design and that I wish they would address them. But I'm not the only player of the game. What I see as a problem may not be seen as a problem by others.
Whether we like it or not, reaction within the JP players base is going to affect the developers a lot stronger than NA player reaction if for no other reason than they play with the JP players and not the NA/EU players. They're going to see what players are saying in the JP chat about the game. They're not going to see what NA and EU players are saying.
The best information we have about what JP players think is from those that came over from the JP forums to post in this thread. They said overall the JP player base is fine with healing design because it's what they're used to getting from JP games. If that's the case and in game comments in JP chat more or less support that, what do you think they're going to do?