There's the crux of the matter right there. We have this fantastic resource, SB, in which we can absorb the collective wisdom of highly experienced divers. But it isn't of interest to most divers. I think the System of shops and major-agency OW instructors who teach whirlwind courses, as full of potential conflict-of-interest as the System may be, serves most divers reasonably well. I think it's the way it is because economics and the desires and abilities of the average OW student dictate it. The low market price for an OW course has to be offset by gear sales, dive trips, etc. As far as I know, statistics bear out that "be back on the boat with 500 psi" is not resulting in that many out-of-air incidents. That's not to say that improvement is impossible--inroads are being made in some areas, such as the idea that students don't need to kneel on the bottom quite so much. But I doubt the System will change radically. It works well enough for the majority of divers to dive safely enough.
For those few prospective OW students who come across SB and find themselves agreeing with those who point out inadequacies in the System, there are alternatives to the System. There are instructors out there--some are on SB--who charge a little more but will gladly speak with the prospective student, will not try to tie the course to gear sales, will teach to high standards, cover proper buoyancy and trim and real gas planning, etc. The course may take more days than a typical OW course. Those instructors may not be local to the prospective student, adding to the cost, of course. But this alternative to the System that mass-produces minimally competent new divers IS available to those few to whom it appeals. One just has to pay for it.
Agreed.
In particular about the "back on the boat with 500psi", this does work and I would not be surprised if a lot of the OOA incidents are due to inattention rather than an equipment issue.
Yes the system isn't perfect (nothing is) but it does work for the "herd" (which is probably about 90% of divers). Some people go past the herd mentality (and end up here) and can take their training further