User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-96.4.165.157-20160115174740/@comment-26336535-20160117163420

Avant hasn't been outclassed because he already destroys difficult content with ease. If they released someone even stronger than him at this point in time, it'd break the game. I'm pretty sure he's one of those units meant to hold a lasting place in the game, like the Global Exclusives (for example, people still use Hadaron, Aurelia, Zedus, and Tridon in difficult content).