I was thinking about all these discussions this morning, and was wondering to myself, "why does anyone care? These people are maybe some of the best players playing, many have killed T5, why do they care?"

So I came up with a few answers.
  1. They're secretly insecure. Thats kinda the copout though, so lets ignore this one. But if you get angry about this, imma put you in this group. Its also the catchall =D
  2. They care so much about their personal dps because they want to be the best they can be. Thats pretty noble in a way, but then I want to ask, say your class is the lowest (or the highest) dps. Why does it matter? If you are doing as well as your class can possibly do, noone is going to fault you. Maybe for a certain fight your FC won't bring you. But that doesn't matter right, you want whats best for your FC. Or maybe you're afraid they will cut you. See point #1.
  3. They want to know the best class for a fight because they want to be the best/most wanted/etc. Thats a decent reason, but its pretty late in this patch already. You've accomplished all you can do (or are on your way to). As far as I know no classes are being cut, but some are more desireable than others. Again, see #1.
  4. They're worried that certain classes are incredibly unbalanced compared to the others. This is largely untrue, with the exception for BLM because that class is so broken, but not in ways of DPS. Until SE acknowledges they screwed up with infinite resource, I refuse to back down on this.
  5. They just like to be right/argue. I fall under this category =D