Are people really confusing the 12 fps animation style of the MIles Spiderman as 30fps here or am I crazy?
This isn't really an accurate depiction though because it's very rare that things are usually played at even intervals like that. Timing, blurring, and smearing make a difference and are usually used in these situations especially for 2D. FPS is taken into account and is planned for when animating. This is probably a better representation:
Sure there is a noticable difference but it's not anywhere near as stark as what you posted. The quality of the animation matters. It's why people think Akira is animated at 24 fps when it's not, the majority is 12 fps like almost all cartoons it's just animated well so you don't notice.
It's because of this it makes it hard for me to get over people parroting 60fps as gospel as little more than bathing in the propaganda. It matters more that it is running consistently and the input rate is high and accurate. But of course companies want you to want 60 fps, it's a way to trick you into buying something. But people don't even know what they are looking at most of the time. I don't hate 60fps but people are getting kind of ridiculous, especially when you consider 60fps has always existed and been an option and with regards to film it was often cheaper. That's why soap operas were filmed at 60 fps. Even shit like the NES or SNES usually ran at 60fps.