I can’t argue with anything above but, just because an investigation closes, that doesn’t mean that there is an adjudicator sitting with nothing to do just waiting for the file to be placed in his inbox. When investigations are complete, there is further review for completeness and those guys aren’t just sitting there waiting either.
So, that’s the first point . . . Each step involves a wait before the case is assigned.
At the adjudication phase, I doubt that there is only one step there either. My guess is that there are at least three or four steps through adjudication. Reviews that are designed to keep “all things equal”. Basically, quality assurance/control reviews so that, as much as possible, decisions are the same from case to case and over time.
This is a complex process. The inability to see inside is, largely, done on purpose. It makes it harder to game the system.
I’m not sure that the complicated files get put aside. They just take longer at every step.
Then, of course, if they decide to deny you and issue an SOR, you have another series of steps where one lawyer writes up the SOR draft and then this is reviewed again . . . several times . . .