Yeah, no nerfing Brutes thats silly. Scrappers still outperform brutes on Offense due to various set mechanics and crits, and with similar defensive base stats it evens out where Scrappers shine with sets that give +Offense (Claws for example) while Brutes shine with more tankier builds that don't hit the same peak offense as scrappers.
Tankers do not follow the same path where they have X more defense vs Y less offense, its a much bigger gap on Y compared to Brutes.
If that gap was shortened, it would just be too homogenous and actually threaten brutes IMO as then you have Tankers who are easily tough WITH decent damage that doesn't need maintenance. Tankers need to be build sideways, not upwards. Things like way better AoE capacity, spreading buffs to the team through sheer presence on top of being a tank (Think how superman inspires the team! Grant Cover! Physically taking the damage for the team and granting a res boost to everyone else! Etc) are the way to go where they still play the same but have a distinct playstyle difference.