Recover HP/MP while standing still, out of battle, and enmity zeroed

[NoctisUmbra]

I'm still not 100% sure about this myself, although I really wouldn't mind either way. It is possible to be engaged in combat without ever performing an action against an enemy (someone in your party attacks a mob). In this case, the mob is claimed and you are engaged in combat, but there is no enmity meter under its name. In other words, you're engaged in combat but not incurring enmity.

I'm assuming that once that enmity meter appears you will be "incurring enmity" as they put it. But that's just the way I took it. I have no problem waiting 2 days to see for myself.

Based on previous use, there are really two ways to interpret "incurring enmity:"

1. You perform an action that increases your enmity value.
2. You have a target's attention. (blinking red)

Accounting for a situation as irrelevant as standing and doing absolutely nothing from when your party engages a target onward is silly.

Regardless, one can at least appreciate after reading the patch notes that it is indeed probable that HP/MP will regenerate between spells. That alone casts significant doubt on the argument presented by the OP.