This is so very true. You cant just simply look at DPS meters and rankings to determine who is good or not. There's many in our runs who pull high numbers but many know that it's because all they do is pad or tunnel. Kilrogg if you ignore adds and just straight tunnel boss and cleave hulk you save a ton of time from having to swap to bloods or berserkers and we have 1 who literally has next to no add damage done yet top meters for non visions DPS. Boss still dies now so no one says much.
Same with Iskar, can totally wreck your rankings to down the resonance, or be a epeen padder and just AoE everything when adds come out with a high risk of the resonance getting his cast off but have high DPS.
They could be carrying your group in mechanics and you wouldnt even know it when you do another role if all you look at is meters.
This was much more important during progression when thresholds were very tight, like having to kill gurtogg before 3 stacks you could straight ST to help pass that DPS check, or be a shit padder and just cleave everything for meters. Tyrant Phase 2 too, burn her to phase and or pad for meters. Top guilds likely will look at these things and would rather have someone who does all the mechanics properly with good damage than those who just straight pad