To be fair... it's kind of right there in the name: Healer. As opposed to "Damage Per Second" which is a whole other class, or tank. The focus is on keeping people alive, just like tanks are the damage sponge, and DPS are the ones who do most of the damage. Any damage a healer does is just gravy the way the duty system is set up. Instead of every player being something of an army unto themselves, they are intended to have to rely on one another to successfully complete tasks. You don't like the direction the healer jobs are going, that's a valid opinion. However, you'd probably have more luck getting people to listen to you if you had actual solutions to propose instead of just complaints. It's like the line from Tommy Boy: "Great, you've identified the smell! Step two is washing it off!" You've identified a series of problems, the next step is coming up with solutions. Spend some time thinking through how healers could be made better, and not just "go back to <version> which was perfect." It wasn't; you know it, I know it, so does everyone else. You want to add a new attack for healers, fine, but show that you've thought through how it would impact the overall balance of the game. Also accept that there are likely technical and legal reasons why they may not ever implement your idea. If you're not willing and able to accept that, you should just move on to another game now.
I think they should either scrap, or completely overhaul THM/BLM, but I don't really have any ideas to offer on how exactly to improve it, so I tend to keep that thought to myself. I do hope one day they take up my idea of creating a physical ranged healer though. Maybe for 8.0. They could call it Acupuncturist and they throw needles with various potions on the tips to apply different effects. However, that's about the sum total of what I've got for it thus far, so it would need a lot of fleshing out before it's ready. Maybe another physical ranged job that focuses less on damage and more on causing status aliments to enemies. Possibly even zero damage and allow them to be a fifth member of a standard duty. That one might be a lot of work to implement, however, since it potentially would require reworking the logic for every single enemy, but it would make for an interesting shakeup to gameplay IMO. As any developer will tell you, sometimes the smallest seeming changes require the biggest refactoring of code to implement. Even if the devs wanted to make some changes, it might require a massive overhaul of the code, which then requires a lot of testing, etc.