Chickens starting to come home to roost
Indeed. Clucking hell!
I recall, although I don't remember exactly where, that there were some warnings a couple of years back that the early-standard jets might get left behind. It may have been when Bogdan warned that the business of bringing multiple standards of airplanes up to a common new standard, while incorporating fixes coming out of tests, with the whole process rolling forward so that the depot-upgraded airplanes were the same as new-production jets, was going to be... interesting.
But the logic of the depot is merciless. If I'm running the depot and there's a backlog of airplanes waiting to be inducted, the jets that need least labour and fewest parts come to the front of the line. The ones that need a lot of both may sit in backlog for a long time as new arrivals turn up, like fat poor guys in line at a posh nightspot.