If that jaded horse-cart builder worked at Studebaker (or Peugot or Durant-Dort which became General Motors) it would be bad advice, bc they turned into a car company. Many cart companies did, bc the people with the knowledge of suspensions, etc developed those skills in cart making

Except the point of the jaded person is that building transportation vehicles is a bad industry to get into, because there is a massive switch from cart building to automobile and truck building on the basis that it has become impossible to build a full automobile as a single person.