The general player base needs to improve

[Tridus]

If a healers had finite mp for example then a dps being hit for 50% hp or 75% hp would likely matter more.

It's one Cure II either way, unless you need them to full right this second (which you usually don't). That has lots to do with how powerful healer cures are, although if MP was scarce people would probably actually use Cure I occasionally at 70.