I'd imagine robots like Beauty could flip the house robots, I think it's just a matter of courtesy towards John that they don't flip them. I saw Matilda flipped in one of the DVDs RR used to sell and I can imagine it getting rather expensive and annoying for John if his house robots kept getting broken, especially with the new shell he made for Matilda. Perhaps someone more experienced can correct me if I'm wrong on that, this is just my best conjecture on the subject.
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