I don’t see the issue either. As I said, if I’m on a brute and the tank on the team is doing more damage, I don’t care. The more damage the team brings overall the faster we get through content and get our rewards. And I’m more like to invite a second or even third tank to the team if I know they going to actually bring something useful to the table.
The changes being made are also more likely to get myself and some of friends I regularly play with to try out Tanks. This is a group of returning players who generally despised melee ATs on live.