Edit: I can see how 5 might be OP, but what about 4. There's concern it leads to additional things for summoner like Fester, but I don't think it actually does. You could store a charge at the beginning of a fight, or you could slow your festers down a bit to save for a burst session of a fight (like Titan heart), but I don't think it actually leads to summoner being about to chain 4 festers. They'd get one additional fester, but please correct me if I'm wrong.
I am having tons of fun on scholar. Few games manage a healer that can meaningfully contribute to dps and heal at the same time. This is also the first pet-job healer I've ever played.
That said, I was thinking tonight that it would be nice if Aetherflow (the status) could stack up to 5, while Aetherflow (ability) still only gave 3. Personally I find myself using the last charge of Aether sometimes just because Aetherflow is off CD and I want to get a new stack so that the CD starts rerolling so I have it again asap.
What do you think?