A dishwasher is the only reason you can think of a humanoid robot? How about a robot to load and unload the dishwasher.

The fact is we live in a world built for humans. I have a robot vacuum and for it to be effective I had to setup my home in a certain way, and even then it is not fully effective.

People pay for cleaners to come into their home all the time, it shouldn't be hard to think why a humanoid robot would (theoretically, if it worked well) be far better than a purpose built machine in the home. But also in many cases working with those machines.

You could build fully humanoid robots that solve every problem generically, or you could solve the sub problems much more efficiently - I don't know why everyone is all in on the hardest problem when in software and hardware we find that the "solve everything" tool basically doesn't work, because solving everything is usually solving nothing very fast.