It might just be cheaper to change the not-robot things to fit a robot shape rather than create humanoid robots.

For example, spending ungodly amounts of money to develop a humanoid to flip burgers feels overkill. Probably cheaper to just… replace the flattop grill with an automatic cooker. Which do exist, right now, and have for decades.

A lot of train an automotive stuff can be traced to the size of a horse drawn carriage, same with mny other areas - the legacy goes way back in most places and has immense power.