[snip] Faye explicitly says "AnthroPCs are one thing, but you don't see fully humanoid robots running around everywhere."
Clearly, once the humanoid robots were produced, they became a big hit almost overnight. One supposes that many AnthroPCs may have upgraded to human-sized chassis once they could do so.
Presumably, Bubbles spent quite some time with her squad. Because of her military backstory it would seem that fully sized humanoid robots were retconned.
Not necessarily. We've seen military AI before - Deathbot, who had an ED-209 look to him. As efficient as a bipedal model is, that's still a ridiculously sized chassis to have in close settings. Probably part of the reason why he just sits in a warehouse now.
Now, when Hanners' father down the prototype chassis that looked more human, there was probably a simultaneous development for the military. Because while AnthroPCs are great for companionship...their size (or rather lack thereof) makes them kinda useless for helping handicapped people. Likewise, AnthroPCs are useless in a combat situation. But if you can create a humanoid chassis, well now you have an AI that can tend to someone in a wheelchair or with some other injury, or you now have an AI that can support troops in closer confines than previous attempts.
Nothing needs to be retconned. Technology in the QCverse makes leaps and bounds in a relatively short time frame. Just like the real world. Compare the technology of 2018 with what was around in 2013. 3D printing with plastic was becoming more common in 2013, last year we've developed a way to 3D print metal. In 2013, we discovered prenatal engineering, last year it was artifical embryos. Technology makes leaps and it does so incredibly quickly. And the truth is that the one area that usually takes on the latest technology before anyone else is the military.