Stoutflies, I would have to fall back on that last "paragraph" of my post that you quoted and say that when referring to non-sentient robots, I would guess the idea of using them to replace humans is just as unpopular in the QCverse as it is in the real world. I don't know if you keep up with robotics, but there are plenty of things robots could be programmed to do today that would be cost-effective and eliminate thousands of jobs. In the near future the cost-effective part will spread to other realms of robotics, and probably bump that up to millions of jobs. We've already seen that things are not always pretty in the QC job market (e.g. when Marten lost his first job), so if I had to take a stab at why non-sentient machines don't do all the work it would be along those lines.
I think the reason everyone has been jumping to the AnthroPCs and sentient robots is because they would be the high-functioning robots, and therefore able to take on more jobs. Also, the discussion came up when an AnthroPC filledo ut a resume in the comic. It's true though that you never said that, and even went as far as to say you specifically didn't mean that, so my apologies for being a bit slow on the uptake there.