Ab-intio training is what an FI does most of. The fact is, is that it's easier just to have an FI who can do anything required, rather than someone who can only do certain things.
Bookings are easier and there is no space for mistakes to be made if you have FI's only.
You asked for my opinion and there it is, I don't think CRI's are of much use to schools, unless there comes a time when we have even fewer FI's about and we have to start cancelling stuff because of a shortage.
I would never have an examiner on board who hadn't been an FI before. How can you examine what you haven't been allowed to teach?