As it was said numerous times, prepare to DPS as a tank or healer in Savage content. Especially if it's new Raid Tier and everyone is undergeared.

Apart from that -> it doesn't really matter, but it helps to speed up things and, usually, people really appreciated it.

p.s. It's always nice to encounter healers, who can pull 2500+ DPS, while keeping your party alive.
Kudos to those players.