OK. You may have requested it specifically for the Beatles, but what I was trying to say was that a speaker simulator is a valid thing for any stereo music, not just the Beatles. Even music that isn't hard-panned could benefit from speaker simulation.

When an artist mixes a song, generally it's mixed on reference speakers rather than headphones. So there can easily be effects or even mixing levels that appear significantly different when played on speakers. Common phase interactions between the left and right speakers are nonexistent on headphones. Case in point.