Thanks for posting that piece, Mark. I agree with your thoughts and Gottlieb certainly were KING back in that golden era. Machines were a lot more challenging back then, they did not need toys or gimmicks to attrack players as Pinball was part of the culture past WWII. It was something the Americans were very proud of, and the best designers come from this era. I can understand why younger players don't appreciate EMs. Simply not part of their upbringing.
Playability - I find Drop A Card to be an immensely challenging game. There's a sense of achievement with an EM.