I think I take a bit of a different perspective being a relatively recent beginner who has pumped through the courses and first 50 dives or so quickly, so not embedded in a diving ‘mindset’ or part of a community just yet, and not experienced in the sense of having ‘000s of dives but experienced enough to make my own judgements. I also have some training design experience through which I am looking at this. The system seems to me to be based on a reasonably robust Training Needs Analysis. So I’m going to go out on a limb - I think the PADI system is quite good. I’d also go so far to say that many divers on SB aren’t it’s target market-it’s aimed primarily at a mass casual market and yet highly experienced divers on SB complain that it doesn’t meet their relatively niche, specialised expectations.
The OW course is what it is, it teaches safety skills to get a basic qualification (and just watched my GF get her OW, accompanying her on Dive 4 yesterday). It’s explicit about this and doesn’t claim to be anything more. There is no need for much more training at this level, just experience building, and certainly not for the comprehensive programmes some suggest, with Navy Seal style training, underwater stress testing, etc. The terms of the qualification allow the bearer to dive in situations similar to what they trained in-this often gets forgotten. They also have to meet set standards or do more dives. If it was much longer fewer people would do it and the industry would suffer, because the vast majority of new divers just want to be able to dive on holiday somewhere warm, and OW is a means to that end, not to do tec or become an experienced and committed diver.
The AOW delivers what it says, which is extra training and exposure to different environments, again, nothing more, nothing less. So this gives a new diver some more experience building accompanied by an instructor. It also gives a diver controlled and graduated exposure to a greater depth - so 18m for OW, 30m for AOW and 40m for Deep.
MSD has also been mentioned. I started another thread about this so won’t go into detail here, but PADI MSD (for me) was 21 training dives. NAUI MSD is 19 training dives (with no Rescue Diver course). Both systems have a theory course, placed at different parts of the system. PADI it’s optional for amateur, compulsory for pro; NAUI it’s compulsory for (amateur) MSD. Having now read the Encyclopedia of Recreational Diving I don’t think all of this theory is necessary for most recreational diving, certainly not what I’ve experienced over my first fifty dives. I will literally never use most of this information unless I do DM, so why would I need it for (amateur) MSD? It won’t make me a better (amateur) diver. The PADI and NAUI systems are fundamentally different views of the same thing, just reshuffling modules around. I like the PADI modularisation because it allows flexibility and tailoring to personal and local needs. And all MSD means is that a diver has completed a minimum of AOW, Rescue Diver, a bunch of other training and fifty dives, again, nothing more and nothing less. But it’s a useful benchmark of training achievement. Whilst I acknowledge that PADI don’t market it as such and that irritates some people, I see it as ‘the end of the beginning’, an intermediate level qualification.
Both systems are based on sound training theory. Both are based on sound research from literally millions of divers on what is needed at any given level. Both have high and improving safety statistics despite unfounded criticism that safety is low and declining.
Another of the common conversations on SB is what puts people off taking up Scuba. There’s lots of reasons but personally I’ve found the dogma around it to be a bit off putting, particuarly given that some of it seems to be anecdotal or received wisdom rather than evidence based (including ‘you’re not experienced until you have ‘000s of dives’; ‘don’t do DM unless you want to be a pro even if you just want it for personal accomplishment’; ‘you must do fundies’; ‘take your time building experience slowly regardless of how quickly you pick things up’). I haven’t really encountered it in other hobbies of mine including other watersports such as kayaking, and hiking, where there is much more emphasis on having fun and being carefree safely, and less on being a sort of underwater Freemason gaining access to a body of sacred knowledge in a hierarchical system.