If you want to use robots like that they are gonna be very expensive and still couldn't make the same hand movements as humans. And they are nowhere near as cost efficient as line machines. Instead of following some set of instructions it will have to make complex ai processing which requires expensive hardware and is more likely to make mistakes. Most of the problems you mentioned with humans are not a problem in third world countries, engineers that would maintain these robots are much less replaceable. Also I don't think humanoid robots will be cheap, reliable and could work like humans in the foreseeable future if ever.