It is scary to me how much legislating is done by these government bodies inside the (executive ?) branch. I do sympathize with anyone trying to get clear requirements in black and white terms of what is and isn’t acceptable . I think this is more of a systemic failure.
Congress explicitly delegated these authorities to these agencies as part of the administrative state overhaul in the beginning of the 20th century. The reason was to help become more responsive, and less beholden to daily politics by putting neutral experts in charge, and by and large it works. Safety and security shouldn't be party politics.