Except of course the very coconut that this effect is named after has long since died: TV and film doesn't use cococnuts for hooves anymore except when warranted, and people aren't weirded out by horse tread sounding like what horses sound like.

The coconut effect exists as a self-reinforcing problem that is easily broken but for people going "but the coconut effect!". Repetition familiarises: if all the games you play start showing period-accurate pigs, then after a few games that force a bit more realism into your experience you stop going "my immersion!" and instead go "oh neat, this is what they looked like in the era this game is set in?" and then immediately move on because you're not here to start a period-accurate pig farming business.

...usually...