I've seen posts in Reddit an these forums of DPS players claiming they would usually or always commend the other dps. However, when I tank or heal, I usually get more than one commendation. So that leaves one dps without a commendation, especially during times when all party members have contributed to exceptionally wonderful dungeon/trial runs.

So I present this question to you, especially DPS mains:

What conditions would you normally commend other DPS players after you clear the instance?