As someone who has owned a Fiesta, and worked on a Ford auto assembly manufacturing line, I'd love to see some evidence of this. What features are you talking about? Because, having actually built seats for Ford, I know that they explicitly did not include heaters when they were not ordered. It was trivial to just not include the part; the assembly line was designed that way. You simply grabbed one cushion set vs another. Most auto manufacturers are actually concerned about margins and costs, so these things matter.