The stereo mixes came much later and were not overseen by George Martin or The Beatles, There is even a quote I have seen floating around from someone I think might have some insight into this...

McCartney admitted as much when the subject of stereo remixes came up in an interview for Goldmine magazine in 2002. "I'm with you," McCartney told journalist Sean Egan. "We made 'em in mono so I'm always happy to listen to 'em in mono."

But who cares, it's all good.

Although I did think my film analogy was pretty solid.;)