I think you have a point. Moogles is not a terribly difficult fight and pretty much every failed party I have been in is due to healers not using Esuna/Leeches on stuff they should be. Which kind of baffles me as a WHM main.
I've never been able to figure out what it is I can remove and what I cannot (the icons are too similar), and it's pretty unforgiving on how much time it gives you to remove them.