Too bad, AA defence don't care about radar visibility. And Borillo doesn't care about base defence.
Stallion Transport also has 6 passenger slot and it is invisible on radar.Good for them, but that doesn't mean they have to be "easy win" option.
Brutes were already nerfed and they are good as now. If they were that fragile against anti-infantry weaponry then YR era would come back and Brutes would be useless.
With Stallion you can sneak in a base. Or just simply drop the passengers near to the base.
They are not easy win. Each sides has features which can easily deal with Brutes. Terror Drones, Stingers, Rocketeers, Pyros, Tesla Troopers, Desolators, Gyrocopters, Irkalla, Thor, Prism Tank, Hailstorm, Epsilon Adept/Elite (psi burst), Duneriders, Borillos etc.