Again, just piping in for the evening and my reply to this is simple:
This sounds eerily similar to the "real healers" argument I was told is an insult and not allowed (even though I wasn't using it) to describe people with different opinions.
Many people who play Healers exclusively are disagreeing with your position. I play Healers almost exclusively. I VERY rarely will touch a Tank or DPSer (WAR/PLD or SMN/RDM) when the Healer spots are all full. If asked what I want to play in any content, it's always Healer with "but if you need me on something else..." in the cases where I know someone else would rather be in the Healer slot(s), because I'm at least competent at all three roles and I keep my Caster and Tank gear relatively up to date (I know a lot of people only gear out for a single role and so don't have that capability). But I only do that if the situation demands it, and if given a choice, Healer is what I do.
I leveled all of ARR on WHM. HW on WHM. SB on WHM. ShB on WHM. EW on SCH (and no, I didn't swap to SMN). The Job I go through the MSQ with is always a Healer. The only exception I've made to date is Ultima Thul I played through on GNB since I had hit 90 on SCH and had gotten GNB to 89 (since I was running Roulettes on it while doing MSQ on SCH...I'm still not even quite sure HOW I managed that!) so the xp wouldn't go to waste.
I've only ever leveled up using Healers for MSQ, and I use them for my first dungeon runs of any new MSQ dungeon, as well as all the solo instances. I've also done a lot of poking about in PotD and HoH solo with them trying different runs, on all of them but AST anyway.
Contrary to your position: I think the flex Healers are the ones that dislike Healing the most at this point. The people that prefer and enjoy their DPS Jobs more and only play Healer when their friends need them to - or, in other words, the exact opposite of me. The people who main DPS but only switch to Healer if needed and do so grudgingly. Those are the people most likely to dislike Healers.
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Anyway, long story short:
No, the people who think Healers are fine are Healer mains, too. It's not only "real Healers" that think Healers are bad and only people who "aren't real Healers" who think they're okay.
Just wanting to set that straight.