I write it up on basically every power inspection I do. I always make it a point to write the reference of 110.16 so the electrician can read teh text to know exactly what th erequirement is.
Just a side note though: If a person meets the definition of "qualified person" and therefore knows the risks involved and has had safety training, why do we need a sticker "...to warn qualified persons of potential electric arc flash hazards"? Seems like a silly rule to me