Humans made things for humans.

Rearranging everything is better but more expensive. Sometimes it absolutely will be and has been done. There will be cases where humanoid robot is cheaper and easier. That’s not even bringing up new uses like waiter or carer, but those will be much later generations.

Proof of concept. Speed has already increased and it will.

Lots of companies must be looking into humanoid robots and I know they have already been looking into robotic arms