In that case, the raidlead needs to step up, analyze the logs (encounter knowledge can reveal useless padding-DPS quite easily) and discipline the members of the raid accordingly.
Actually it is. There is so much more to complex bossfights than your average DPS. You can have awesome average DPS and still royally fuck your raid by refusing to DPS important adds. (just one obvious example).
I think such an indicator would have the same effect than "personal" recount: people would fixate on it and do everything in their power to keep it in the "green" range. Just like people fixate on their recount bar, attempting to make it as long as possible.
Not every mechanic is as glaringly obvious as a big rock falling on the head of your raider, instantly reducing him to red goo.
Oftentimes people die to a combination of things and it takes a bit of analysis to separate the avoidable from the unavoidable in order to reveal the mistake.
To be perfectly blunt: i think people blow this recount "mobbing-drama" way out of proportion. God knows I don't always perform exceptional in WoW. Esp when playing my alts. But if I go into LFR (the cesspool of flaming retards) I go in when I can play my class at 80%+.
Yeah my DPS will suck, because my item level sucks, but everyone knows that.
Not once have I been flamed for it.
People in i700 doing 10K dps and being half AFK pressing a button now and then while watching netflix... In my opinion these people deserve to get called out Insult free ofc, I don't tolerate rude behavior in video games.
Be direct, sure.
Be clear.
Be so in a polite manner.