Those aspects of a vehicle are only commoditized if you discount the massive amount of time poured into design, integration, and manufacturing engineering. It'

Those aspects of a vehicle are only commoditized if you discount the massive amount of time poured into design, integration, and manufacturing engineering. It's easy to buy some bolt-on aftermarket automotive product and attach it to your vehicle. Actually integrating that thing in a way that meets (sometimes conflicting) safety, reliability, manufacturing, cost, manpower, etc. requirements can be a special sort of hell that you wouldn't wish upon anybody.