The advantage of a provisional approval is that the company records data from patients taking the drug in the real world, so after (or "if" if you prefer) 2-73 is approved for the drugs now in trial with continued positive results I would expect the company would simply have to make a scientific case for each disease and then go into PA and reporting those results.
Again, SLEEP will be sufficient justification.
Also, since there is a real world population being watched, if there is ANY suspicion of toxicity patients can be analyzed 5-10-20 years into the future. Birth defects could also be identified in the second generation. This is 21st century medicine.