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Here we actually do have modular parts for cars (at least common consumables, like headlamp bulbs, are normed into a range of a handful of types which are then stocked in all service stations) Schrader valves also mean that stations only have one type of air filler (which here is also always the same: a small bottle with a tyre pressure gauge which can be carried between the refill station on the wall and your car wherever it may be)

As for ways to turn sour, I'm afraid you're underestimating humans. We can't have nice things. (Ok, we can, we at least get some nice things with something like the square root of time... but we can't have all the nice things we could have had if we weren't so prone to defection)