I think there should be more emphasis on PPB at the OW level. Not all divers continue on to AOW therefore they should know how to control their buoyancy when they are given their
OW card. I have seen divers taking other specialties without the basic buoyancy skills needed. I also think there should be some minimum number of dives required between OW and AOW. There are many students who complete these courses in back to back weekends, who have the AOW card but have less than a dozen dives under their belts, all of which were training dives. are they really advanced divers???