I think Android’s (https://m2.material.io/design/iconography/product-icons.html...), Apple’s (https://developer.apple.com/design/human-interface-guideline...), and Microsoft’s (https://learn.microsoft.com/en-us/windows/apps/design/style/...) are more detailed than that.

(And yes, that’s comparing to the work of huge companies, but I don’t think that matters for deciding whether to call this ‘extensive’)

I also do not rule out that the tech choices they made (partly) drove the guidelines. It doesn’t make sense to proscribe things the OS cannot display.