See how many of them relate to update changes and are tied to newer methods that should be switched to.

EDIT: A lot of them seem to be Mojang's weird choice of using @Deprecated for certain methods. According to Forge this seems to have to do with @Deprecated annotations meaning only to not call a method, but not to avoid overriding it, so it doesn't mean that methods annotated this way should be avoided completely. I believe its related to stack vs item sensitive methods as well as state vs block sensitive methods.

Gonna consider this blocked since it should probably be worked on during code cleanup after #518.