Having to use The Keeper's Hymn to switch your INT to MND if want to play SCH from SMN is what I think of with there mindset. I wasn't there for XI but from what I've played of it in the recent years my experience with WHM in XI spends most of it's time focusing more on management of HP, resting, and cleansing with the occasional Dia also if u didn't have a RDM you'd Paralyze. They later came out with SCH which can shift between the two but was primarily a support DD. I know it can be seen as super unpopular opinion to bring up XI but it's not like they had this notion of that just because. Accuracy also comes to mind. I guess they didn't expect us to hit the boss as much either even though there was Materia for it that any class can use. I personally think the statement is kinda...I don't know blind? If their testing consisted of testers whom played XI I can see this angle to some degree. Players will always find a way to surmount the odds and in this case, a very unexpected way. But the tools were always there so that statement always feels blind to me because of that. Ask a MNK about their poison pots, surely they are crazy yeah?
MNK statement is a bit off topic so I lead into another question. Why even give Healers an option to even contribute? Even if they had weird scaling why even offer in the first place? Did they just intentionally want to gimp them because they just didn't expect anyone to press more those buttons? Are they forcing us down this path now because of this? Or maybe.....Now this might be dangerous to say....Maybe we weren't suppose to have some log of sort to see the damage? Maybe it's just accessibility for controller players? It's all hard to say and I guess we'd get the answers after the game has long pass perhaps 9.0 or 10.0 if they ever want to open up about there decision making more so.
There's many questions I think should be towards how they test things and approach design. It's impossible to gauge player input without players and it'd would be dangerous territory to say the devs probably don't even play there own game even though there can be evidence of such in many ways. I don't want to really go down that hole. From what I do know in my early days playing the game that there weren't many of us as of now which is amazing! I was lead to believe that this game wouldn't make it and the doom prophets about at the time. Yet here we are! To go back to my last point from the early days, I guess that wasn't enough to work off of? This game was prided that the dev's listened. That was probably because only a handful actually played and even way less raided. At least in my circles and experience, they will sing songs of the days of 3.0 raiding but they won't talk about 2.0 raiding and oddly enough 4.0 raiding. Well, maybe to why I don't hear much about 4.0 raiding is because most of everyone I knew prior quit the game at that point and most of whom I know now have started in 5.0.
Apologies if it sounds tangent or a bit of a rant.