I have a few thoughts. Number one is that humanoid robots are probably a dead end. It's movie stuff. It makes me think of Henry Ford saying customers want "faster horses". It is the fault of evolution that we don't have wheels but we don't have to repeat that mistake. Secondly I think robot butlers are a bridge too far. The article explains pretty well why the spatial reasoning is problematic but so would things like…
Our shape is very flexible.
It's probably not the end-all most flexible format out there, but whatever format we end up with will probably be more similar to a human than to a 6df robotic arm mounted on a car. (It will probably have legs, for a start, not wheels.)