You are correct the executive branch of gov has a cabinent of 15 different departments: Commerce, Agriculture, veterans affairs, education, energy, Defense, Health & Human services, Homeland Security, Housing & Urban development, Interior, Justice, Labor, State, Treasury & Transportation.

The POTUS appoints the head of each cabinent member (department), but I find it unlikely that the WH staff can micromanage the minitua inside of every single rulemaking event, in every single department, unless it is extremely politically charged, with outcome that can effect the majority electorate. (i.e. the morning after pill where HHS overuled the FDA- big politically charged decision)

In this case the rulemaking inititiative had some congressional and political impetus, but unfortunately "we cargo guys" don't matter in the bigger picture of $$ & politics.

From History -the WH appoints cabinent members that align to its vision and goals, but as pointed out by others- there will never be an encompassing saviour- more of a general policy direction.

I'm disgusted by the outcome, but I applaud them for partially addressing the issue and finally making a decision for the majority of commercial pilots.