top 10 jobs after chaos?

No pomegranate they aid in you not dying but if you didnt die from the damn attack you eventually got hit with what is the whole point of using them? To SAVE POTS, which ISNT the objective in bossing.. The objective in bossing is getting your maximum dmg output while not dying!

It does looks like you haven't played enough games with pot cool-downs to realise this...the reason why a player should avoid getting hit and attempt to conserve potions in a pot cooldown situation has nothing to do with "saving pots", but to "avoid having to use pots". These two points are vastly different; the former implies that the player is running out of either potions or money and thus has to ration them, but the latter implies that the player is trying to avoid using potions so that there is a lower probability that he will be caught by a near-fatal attack (and end up dying seconds later) while stuck in pot cooldown. This is by no means foolproof; he might end up getting caught in pot cooldown, but at the very least this wouldn't happen as often.

Invincibility frames are also very useful in maintaining high DPS. Think about it; would the party's overall DPS be better maintained if you die only once/twice throughout the entire fight (due to being hit right after the iframe ends, as you mentioned), or if you die ten times in the entire duration of the fight due to you not abusing the iframes at all (or not doing it enough)? Obviously, it would be the former case. Of course, if one focuses purely on staying alive instead of dishing out damage to the boss (this ain't a bullet hell game, dude) the party's overall DPS would suffer either way. Therefore, one should strike a balance between survival and damage-dealing to optimise party DPS, though survival is a little more important.