That's a self-referential sentence if I've ever seen one.
Well, people from PUBNAT1/2 without a date are very few and far between. Most are cases where their process was put on hold for one reason or another, or they fell through the cracks of the system. 3/4, there are some, but the majority of them have begun as well.
It's not facility rating that's important as much as need. Simply put, the places in more dire circumstances will usually get class dates sooner. It's not always consistent, as you noted, but that's the general idea they're trying to follow.