Patronage
Serving officers on the MAA will be subject to the pressures of patronage and promotion. I doubt that they will be able to be perceived as independent.
At the bottom end of the tree, the only people who are likely to be appointed will be the no-hopers. It would be the kiss of death to the careers of most of those below Gp Capt. So lots of people looking for a quiet life will not tend to make good things happen.