Would you like an in-game parser?

[Reynhart]

Even if 1k dps is done and group manage to kill it, doesn't mean he did enough of his own weight.

No, he did enough. But, yes, maybe he didn't do his best. The problem is that enough is enough. And since goals are actually based on best players, everyone wants the absolute best, even when it's way over enough. Just look at the old "PLD sucks" topic...PLD did enough to beat savage, yet people pushed it out because WAR or DRK did better.

Good example, you join a ravana group back in the days when ilvl was lower, ever dps be pulling 1k plus while one does 550? Is that acceptable?

No, it's not. But this community is way past such a trivial case. Even back in 2.0, people requested relics to invite you to Titan Hard mode. When the Novus was created, having anything besides full Det/Crit was considered garbage. And I remembered people posting that full Det/Crit and Det/Crit/Accu (to avoid rank IV materias) ended in less than 5% gap in DPS.

The problem is that the more you give players means to judge others, the harsher they will become.

if they knew anything they would know in order to get higher DPS in this game you have to perform the mechanics perfectly.

Did you miss the part where BLM are encouraged to stay in AoE to not lose any second out of Ley Lines ?

The performance of a DPS (or any role for that matter) is the sum of their ability to perform their role and deal with the fight mechanics. While that ability to perform one's role is transparent in the case of tanks and healers, in the case of DPS that transparency doesn't exist due to a lack of parser DPS measuring tool (really should be called this more than naught since there are some pretty key differences between the two).

You forgot to mention how tanks are healers would also need a parser to do the most DPS they can...and you also forgot that we have Stone, Sky, and Sea, which gives a precise objective in the DPS requirement without showing any actual number. Who could have thought ?