End of the day, there are different groups of people. So any solution is going to anger a lot of them. Some want to do more damage while others want to do more healing, some want to do more of both while others think the system is fine as it is today, some want to do less healing, some want to do less damage, some would rather cast buffs on party members. The conversation is also strongly weighted by Savage raiders and ignoring something like 70% of the playerbase that...doesn't.

Needless to say, you aren't going to please everyone.

My personal solution is to realize we have four healers and have one each focus on the different groups. The only problem with this is you have the people that want to play a SPECIFIC healer but also have the specific playstyle on it. For example, if you gave SCH its SB kit back with all the DoTs and damage abilities like Shadowflare, Bane, etc but left SGE alone for the people that like the current playstyle, you'd have some SGE's complaining that THEY aren't getting the "fun" kit. Meanwhile, you'd have some SCH's complaining that their Job got "the short end of the stick" by being "stuck" with a bunch of damage spells they didn't want, didn't ask for, and now have to work around and use, and thus is less "fun" for them.

So there's no way to make everyone happy. At this point, we should just understand that and realize the solution that makes the MOST people happy is to have each of the four healers have a different focus and playstyle. e.g. WHM on GCD healing and simple damage, SCH on oGCD healing and plate spinning damage, SGE really flexing Kardia and functioning like a WoW Disc Priest to work damage dealing that generates party heals through maintaining a strong damage rotation, and AST as probably a healer specializing in casting buffs on the party continuously while weaving in damage during "buff downtime". Then players can migrate to the Job that fits their personal style the best, and if they REALLY liked a Job's aesthetic that they don't necessarily enjoy the playstyle, ask themselves which of the two is more important to them and be willing to go with that even with the downsides to them.

Many would grumble if it wasn't their preferred Job, but right now, everyone just about is grumbling, so that would probably still be an improvement.