Some people might disagree about these being really important, but I think one of the bigger things limiting the opportunities of using robots is not having a "watch" command. If your robot is in a crowded space, you won't hear a single thing that anyone says unless they either address you, or they're speaking loudly. This makes things like spying almost impossible, and makes robot use a hassle in just about every situation. It's possible there's a work around to this already but I haven't tested it myself.
Also, robots getting dirty but not being able to be cleaned at all can be a little bit of a problem. I've seen people react IC to a robot being dirty, but there's nothing that can be done to get the robot clean, so it kinda just makes a weird situation where IC things are happening for OOC reasons.
These points are just for the cheaper robots though. I think one of the kinda big pain points with robotics comes with the people who invest half a million chyen into getting a cool robot, only for it to kinda be lacking a lot of basic functions. But at the same time, it's hard to justify lowering the price, because then those players probably don't feel like it's fair that they had to pay more for the same thing, and also robots can still be very powerful in certain situations, especially with some GM help. Not really sure what to do about that, but thought I'd bring it up anyways.