When you test drive a car from a dealer and like it and want to purchase, the dealer then doesn’t go “that’s great, we’ll give you the exact same car but it’ll not have a steering wheel, stereo or lights but the bulk of the car (95%+) will be present, so you should have the same experience…..”
Your analogy is the wrong way round.
If PRT were the car dealer then they would give you a demonstration car with no wheels, no brakes, and no seats and then ask if you want to buy one that has got wheels and brakes but still no seats!
Although I guess at the moment if PRT were the car dealer then I have a demonstration car and a real car but have not paid for either of them yet.