The main problem with putting the Lily proc on Regen is Regen isn't gated to one target like the fairy is. That's also why I avoided Medica II. Aero spells have the same problem. Sure getting the proc multiple times per server tick would be great even if it's RNG based, but having played Bard I can see how frustrating that would be for an actual healer to have. Limiting it to on-cast would be healthier overall, and that still wouldn't be enough, ultimately. Maybe if Lilies were more granular like all of the other 0 to 100 job gauges that would be fine but I think that's the opposite of what people want.

That's why I went with Stone. Because you can only use it on one target, ever, and as you learn a fight you're using it more often than the Cure line and Medica rather than vice versa.