Comment by egypturnash

If you really wanna see some frame rate variation try watching anime; you'll see a very different set of choices. More complex character designs mean more time has to be spent per frame, but the budgets are generally similar so they've gotta find ways to make do with a lot fewer drawings because there's still only so much artist time available for the budget. So you'll end up with decisions like "let's move the camera elsewhere while this character talks instead of hassling with all that lip flap", and "let's just do a traceback of this drawing and flip it with the original on some eccentric timing to just barely keep it from going dead on the screen", and then at the end of the episode there's a really awesome scene with crazy camera movement and crazy dynamic action that is clearly where at least 50% of the budget went. And once you get into the vibe of this it's really amazing, and as GenX kids raised partially on cheaply-dubbed anime have gotten into the industry we've started seeing a lot of this kind of timing happening with Western projects. (Not that we don't have Western traditions of eccentric timing, go single-frame some forties WB shorts or some Ren and Stimpy[1]).

I do not have any studies to point to but my experience is also that a stylized cartoon drawing takes more time for the viewer's brain to process. There's fewer cues for the brain to grab, and the abstracted shapes don't help either. Going slower gives the brain more time to register what the hell's going on.

Originally the frame rate choice was largely from technical and budgetary considerations but now that the medium's a hundred years old and has had waves of inspiration and influence cross the entire world multiple times, frame rate is definitely something an animator can make deliberate aesthetic choices about. Budget's still a concern though!

1: the Buzzfeed article about John K is 100% true, I was a confused kid working under him during the time it covers. He's a horrible person who did some work that influenced a significant chunk of a generation.