Missing generic netlink controller operations

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While messing around with libnl and netlink I noticed that despite existing in an enum in linux/genetlink.h, the CTRL_CMD_{NEW,DEL,GET}OPS operations (and in fact, all operations except for CTRL_CMD_{NEWFAMILY,DELFAMILY,NEWMCAST_GRP,DELMCAST_GRP}) are unimplemented, and have been around, untouched, since the introduction of the generic netlink family. Is there a reason these exist without implementation, or has it simply not been done?