My point is: the degrees related to aviation aren't just worthless pieces of paper, they just constrict you to a very limited number of options
Not necessarily so. You may need to look at the actual content of each of the different "aviation management" degrees. Some contain more "management" (which is applicable in any industry) than others. You cannot generalise that all aviation degrees are the same.
And, to reiterate previous posts, a degree aimed at a specific industry does NOT mean it excludes you from other industries as well.