DPS display could easily be solved with a system already in game.

[RiceisNice]

Seeing a damage dealt number is incredibly black and white. While our MNK can perform well in t13, the moment he gets marked for the first three earthshakers in phase 1, his overall damage dealt nose dives.

Now on my end, I personally have kicked people who underperform their roles (tanks not using CDs, healers not filling in the holes, dps not performing optimally) out of my farming parties. Though honestly when you lead/co-lead a raid, you can easily tell this without a parser. A DPS does not follow their rotations properly or keep uptime on buffs/debuffs, tanks struggle on snap aggro or using their cooldowns, healers can't prep up their mitigation, I can easily see all this just by watching your animation or the party list. And it's not like I kick them immediately either... they either immediately bail because that was the wrong where they got their stuff, or I give them advice and they give a shitty reasons "We cleared it, right?" "I play how I want" " worry about your job" "none of your business", etc etc.

A parser only helps with solidifying information when it comes to dps. Sorry but I really do not feel like carrying people through an EX primal or coil farm who does consistently less than me (and I'm in shield oats) or less than darklight-dps. It's only a matter of time when that sort of slacking becomes detrimental to content clears, so why the double standard of protecting the dps from "harassment" from not doing their role optimally (dpsing) when tanks/healers are immediately pointed out?