Earlier quoted context omitted.
A fundamental difference between Japanese and Western animation is their approach to motion. Western animation emphasized fluid motion, attempting to stick to the maximum framerate (24 FPS) allowed by the film medium as much as possible. This could produce striking results, but tended to limit artists to more simpler, slower, more deliberate stretch and squash movements that would make sense when interpolated across…
No source for this, but I remember hearing an interesting anecdote some time ago, and I'd love to know whether there's any truth to it: Back in the 50's or so, when the major American animation studios had a couple decades of experience under their belt but anime was just getting off the ground, some Japanese animators took a trip to Hollywood to learn how the industry worked in the US. They were given a tour of a ma…
My interpretation was that anime's more limited, stylized animation was due to its direct influence from the prolific manga artist and animator Osamu Tezuka (sometimes called "the Walt Disney of Japan.") All comics, Western or Eastern, must heavily stylize motion in order to have any hope of expressing it in still frames. So having an accomplished dramatic comic artist lead most of the earliest, most influential Japanese animations, most of which were direct adaptations of his comics, working with the low framerate stylized motions that extended naturally from comic book stills, seems to have had a profound effect on the Japanese school.
In contrast, Disney's early animations were inspired by conventional cartooning in subject, and early film and Vaudeville in motion, so given Disney's influence, it should similarly not be surprising that the Western animation school tended towards comedy and fluid motion that attempted to emulate the impression of film.