Expanding on your analogy, the issue is when you need to start using your free car to safely haul lots of freight across the country in a timely manner, over mu

Expanding on your analogy, the issue is when you need to start using your free car to safely haul lots of freight across the country in a timely manner, over multiple routes all while providing sound, reliable fleet maintenance with a team of mechanics. Some auto shops will tell you that duct-taping your freight to the roof of your car is just fine, others will tell you that you cannot run a reliable network with this system.