I think part of the issue is that there is a fundamental disagreement about what a Brute's role is.
Those from the "broots are DPS" side don't see Brutes as actual tanks, after all Tankers have tank in the name.
And thus Tankers shouldn't do damage like DPS ATs you know, like Brutes.
Those who see Brutes as the lighter/higher damage Tank AT don't see the issue. Because most MMOs have heavy and light tanks.
Those sorts of arguements will continue, game testing or not.
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We're actually lucky the Brutes are tanks camp isn't arguing to keep live Tanker damage, and just nerf Brute damage for being too close to Scrappers.