Rank inflation is not just a RAF issue. I think you will find it in every Western Military.
In the good old days Squadron commanders only had to create operational capabilities. Now they are so loaded with non war fighting admin BS they need to be indoctrinated at staff college and have all the other “career broadening” postings before they can be trusted with a unit command.
Unfortunately rank inflation is a self licking ice cream cone. None of the existing senior officers are going to admit that they are over ranked for their positions.