Personally I am set against DPS parsing on a party scale.
Maybe a personal DPS checker that only shows your DPS could be implemented, this way you can only become competitive with yourself, and choosing to compare scores is a team choice.
I do agree with you on one hand that it is annoying not knowing, but on the other hand this type of feature adds toxicity to the community, a reason they did not plan add it.
Some people love to top dps charts, with little regard to others, such as blms that refuse to move in order to max dps, but put unnecessary pressure on the healer busy trying to avoid the mechanics. (an example, not targeting anyone)

If top dps *Sometimes* people jump on their high Chocobo and proceed to talk down to others, at least in my exp. There is nothing wrong with trying to better your skills at all, but play for fun, not for efficiency. If you find being efficient fun? Thats fine, but remember some dont, and they do not play games to be shouted at or dictated to.