What are you going to do with your car? Drive it up a mountainside?
I don't see a Minecraft portal gun as quantum science. I see it as Ender technology. Pipes are some Minecraft material wrapped around some glass. A car is a ridiculous piece of machinery that doesn't fit in the Minecraft world. There's nothing you can do with a car that you can't do better with carts, tracks, and a quantum suit.
Yes there is because its cheaper than having to mine tons of iron and makes it easier to escape from mobs plus, ive played the portal valve games and Cave Jhonson stated that it was a quantum space hole in one of the trailers. Also that I might add I want to turn a car. Can you turn a minecart no you can't. I don't want to waste a lot of my time getting to where I want to go.
Decent transportation = carts, boats, pigs, portals, books, Ender Pearls. Books can't transport you any where.
Look, everyone's entitled to their opinion. What I think is wrong with yours is that you assume that if someone disagrees with you, they're being sarcastic.