That's the point. Nobody or rare people complain when Extrems get mounts or glowing weapon. People know how it works and it's not unfair (and we are still able to get the glamour later). Only few people complain that Savage get mount and dyable gear. Specific reward for specific content... that's fine.
The problem with the current AF is it comes halfway. The fact problem here is less due to the fact it is locked, it is it was not previsible, especially after Eureka and even more considering how Ex usually work : specific weapon and mount (even thought we can get them "for free" the next extension with "special" mog or soloing content when overstuffed -fight with a jail excepted-).
In fact I'm less disappointed by the lock than I'm bothered by the precedent they are creating with this weird EX reward. Because most people who don't do Ex will even less do an Ex for just a glamour (most of time, only one piece is interesting and we can find something to replace). And if it should happen the AF gear upgrade as the weapon, people who don't do Ex or Savage/Ultimate have no use of such upgraded gear since the tome/alliance/normal raid ones are more than enough.