Yes, their numbers are specified in legislation, which should imply the following - If something is a practical necessity it wouldn't require legislation mandating it.
First, this doesn’t really make sense. You don’t seem to have a proper grasp of the meaning and usage of the word ‘imply’.
Second, there are plenty of practical necessities which are still mandated by legislation. One of them is that you need to follow the instructions of the crew, whether or not you feel that they’re beneath you and would benefit from your efforts to ‘educate’ them. If you’re unwilling to comply with this particular piece of legislation, then you need to find an alternative means of transportation.