Yes. Re-read what you said. Repeatedly.
The context is that your party comp afforded you more mistakes. That's one of the biggest arguments in favor of this thread's existence.
I think one of the major draws to this game's endgame before was that numbers were so crunched down and classes were so finely balanced that people could absolutely argue skill level was a bigger factor over class composition in determining clear rates. The uproar is so loud now because the balance has tipped to a point where for the first time in a long while, we can no longer definitively say that.
The current state of the balance has shifted in favor of class composition, a problem that plagues many other MMOs that a good number of people in this thread likely migrated from. Even though skill level is still more important, the very threat of class composition overtaking personal skill level scares people, and most people obviously don't want this spiral out of control when there's absolutely nothing good about it for the long term health of the game. Especially in a vertical gearing progression MMO such as this one, where there's only three major pillars that contribute to your personal performance - skill level, gear item level, and class. All of that is compounded by the devs being historically slow to address the concerns of some of the classes that were in trouble last expansion. Even for the short term, there's the consideration that a new Ultimate is around the corner on top of that.
Do people here want another story? One of my static members played Dancer throughout this raid tier, but switched to a minimum ilvl Monk for E4S. So he's got a wall of 85-95 percentiles from 1-3 on Dancer, and then an 8 for Monk in E4S. He tells the rest of us that his Monk still consistently did an average of 200 more rdps than his geared Dancer at each major checkpoint during the fight (and the gap I imagine is only going to increase, as the monk fists dropped last week).
On a side note, I don't extensively play caster, but I'm still of the opinion that the raise tax on RDM and SMN is a slightly bigger problem than the situation with the three ranged classes. Of course, all these issues should be addressed at once, but the raise tax is more problematic from a design standpoint because - as I've said elsewhere - the whole party already gets taxed from someone dying in the first place, placing such a heavy tax on the two casters for simply possessing a skill (that's usually used by the healers first) that might reverse one wipe into a clear out of many dozens of failed pulls is absurd from a logic standpoint. There should still be a tax, or else who would take BLM - but it should not be as wide as a 1k DPS difference.
But that's probably the big difference between you and me. My interest in this argument is from the standpoint of a designer. If you came in here with an actual purpose, then enlighten us: What, exactly, should be done about the current state of the balance?