1. Maybe the point I was making wasn't quite explained correctly. they originally said NIN and MNK are the same, I mentioned DNC, they said, no, DNC doesn't fit, then listed a few criteria. I showed that DNC pretty much does fit that criteria. So, why is it they wanted to exclude DNC from that list? Maybe it is because jobs are more than just broad strokes.
2. Assuming we are still talking about NIN and MNK, they both have different combo structures and generate gauge differently. Ninja also has overhead on their gauge where MNK (currently) does not. Again, most jobs have a 60 second personal, most jobs have a 120 raid buff, most jobs have a gauge. However, there is a reason I like playing Monk and generally do not like playing Ninja.
3. I'm basically agreeing that every healer plays very similarly. However, the original blanket statement of 'all jobs play the same' isn't true. The fact we can single out healers from the rest as being an issue means we are looking into things with more nuance than just broad strokes. The next step is looking at healers and seeing how they can make them different. As an example, Sage and Scholar both treat shields differently. Sage's shields can be turned into a heal after being applied and even Haima/Panhaima heal if they aren't used up completely. Scholar cannot do that. What Scholar can do is turn the shield into pure healing and forgo the mitigation completely. Maybe they should focus more on that. At the end of the day though, there is only so many ways you can restore HP and there will be overlap. That means, it is down to the rest of the kit and how everything interacts with each other in order to make them feel more unique. This then goes back to'Fell Cleave spam' Yes, on the surface, they are the same, but how they interact with the rest of the kit is what matters and that is what makes them more unique.