>>714893978
In terms of evolution this is closer to inbreeding, where the same genetic stock keeps being reused for new offspring, and then reusing that offspring again instead of bringing in outside genes over generations, people abuse this by forcing selective breeding on animals and plants to achieve some desired exaggerated feature

Evolution usually has safeguards against this and boys and girls that grew up around each other often won't find each other sexually attractive when they're adults even if they're not related, the Westermarck effect

The equivalent of new genes in media is new creators who mainly reference from their real life source and personal experience despite having a wealth of media before them