As someone who enjoyed playing Tankers I can say I'm really disappointed to see bruising go away. I can understand trying to give Tankers more damage, but that mechanic was given to them for the purpose of helping the entire team including them. If removing the resistance debuff was done as a trade off then I think it's a mistake, because the entire team now suffers for that change. I think Tankers have a good role, they hold threat and control the mob like a Controller, although they do it through Taunt and being a hard body. Bruising allowed them to boost their team's damage for significant targets, while also maintaining threat, giving them the power to direct damage. The Tanker holds the threat of the enemies, and in that respect they know who should die first. Bruising was like that, it marked an enemy for death to compliment the intent.
By removing it the Tanker has lost some of that nuance that I thought was the better way to design the archetype. There's always been people who have argued "why pick a Tanker when a Brute deals more damage?" And to be fair, on a full team with tons of buffing the Brute will reach the Tanker cap numbers. But a Brute could never deal resistance debuff.