The thing is... If you have full esoterics gear and are in the same instance with someone playing your class and rocking 180-190 gear with Law or Hive weapon, and you lose to them, you're bad. The gear difference *is* that great to make up for any minor losses you might pick up here or there. And keep in mind that, if it's the same instance, your friend is also picking up those same issues as you are. Assuming neither of you die and you get an approximately even number of A3 tethers (and you didn't eat every single Quarantine...), there's nothing significant enough to shear that 150-200 dps difference away, unless you are playing strictly worse than the less-geared DPS beside you.
So yeah, while an i200 DRG can't tell that i190 DRG who's pulling 100 less than him to GIT GUD, if that dps is reversed, the i190 guy should be allowed to spit that at the i200 without backlash.
And as far as bosses disappearing, it's all about maximizing the fight. The opening phase of that first boss in Neverreap isn't even enough for two full combos to go off, so why are you popping buffs? The second time he's back, he sticks around for nearly 30s, if not longer, so *THAT* is when you should drop your full opener. I rarely finish that boss sub-800 and most pug dps I get can't seem to crest 400. That to me comes across as them just not caring to do well on the fight, probably because they can't see how poorly they're doing.
Nobody argues about the variables that go into it, but when you're in an instance with someone else, and you can manage a certain threshold of damage while the other person is struggling to do even 1/3 of that, something has to be done. If in-game parsers can raise the average score of DF dps by even 50%, I'd be happy.
I'm a firm believer of everyone should play the way they wanna play and have fun with the game their own way. Some people play casually and aren't gonna push 1400-1500 dps on that first boss in Fractal. Fine. But there's a fine line between "playing my way" and "playing in such a way that I am no better than dead weight." I don't expect every DPS I encounter in DF to beat my 900-950 PLD dps on that same boss. But if I see a dps pulling 300-400, rather than, like, at least 600-700, which is *EASY* with *EVERY DPS CLASS* at i160+, I would really like to be able to kick that person for, simply, not doing their job.
Or, I would at LEAST like to be able to say "look your dps is low you should try and work on your rotation" without running the risk of being reported, banned, or yelled at because "I PLAY HOW I WANT." Harder to say that when I tell them "Bro, the Paladin with less gear than you just did twice your damage."