Sorry if I'm just spreading factoids and platitudes, but isn't this the point at which some people say "it's not the wheel that was the hard part; it was the ax

Sorry if I'm just spreading factoids and platitudes, but isn't this the point at which some people say "it's not the wheel that was the hard part; it was the axle and bearings."? So a wheel for a child's toy would almost not even be a wheel.