Hey, I'm not saying the Rustler was an advance in technology....all I am saying is the Rustler took the place of the SRT; sometimes "evolution" takes a few steps back, Jack!
In this case, when Traxxas got out of the "race scene", everything got simpler...one piece molded chassis, integrated rear arm mounts, integrated motor plate/guard, simple steering.....limited tuning.....limited "awesome-ness"! All in the name of $$. Simplify product, cut cost. But you already know this.