a lot of labeling required by NEC is labeling that only makes sense to electricians, and sadly doesn't make sense to all of them either.
Occupants don't understand the meaning of a lot of these labels, worse yet is some of the misunderstanding of what they may mean.
I could even extend this beyond labeling and say marking a white conductor with black tape to indicate it is ungrounded is also right up there with the amount of meaninglessness in many instances. IMO if a white conductor is landed on a circuit breaker and you don't know whether it is grounded or ungrounded.... maybe you shouldn't be messing with it. Black tape doesn't do anything magic here.