If I may add my opinion to this discussion. Firstly I agree with others here that there should be a distinction between a certification and an experience (or better still specialist subject education) While some subjects are clearly a Certification (Using PADI descriptions OW, AoW, Rescue, dry suit, Nitrox, Cave, wreck, et Al) you can debate which category the others fit in to. Some people want to learn more - some don't But there are some contradictions. for instance when I did my OW I was on vacation - After my cert I dived with the Dive shop for a further 14 dives all off a boat - however apparently this didn't' earn me a boat diving specialty as I needed to pay extra for that. They freely admitted that there was nothing else I'd learn about boat diving by sitting the course, but that was the way it was. Remember I was a newbie diver at this point, and had only experienced this dive shop and this destination so believed everything I was told.
This is not an Agency bash:
It is my PERCEPTION that PADI break their courses into bite size chunks. Lets take the OW course. You can easily get a cert in 4 days on vacation thus not eating into your free time too much especially if your partner doesn't want to learn. If you take the BSAC method then the OW (called ocean diver) is 7 classroom lessons and 5 dives, has a rescue element built in and requires you complete 120 mins underwater to gain your cert. Note: I'm Not a BSAC certified diver so am going off their website.
BSAC (it appears) is set up for learning as part of a club so you get contentious assessment and require your log book to be signed off at the end of each dive when you have completed each module or task.
Note BSACconsider Padi OW/AoW to be ocean diver.
If you want to progress in BSAC (I'm starting the cross over hence some knowledge) then Sports diver expands and reviews on Ocean diver (I hate the terms) and includes Basic deco diving Learning to be an assistant to a DM , SMB deployment, more navigation and incremental dives to 35m Again you need a further 150mins under water post Ocean diver (this isn't a complete list you are advised to look up SUMMARISED CONTENTS OF SPORTS DIVER TRAINING PROGRAMME from the BSAC website.
From there you get to Dive leader (equal to DM although you learn to dive to 50m)
My point here is that the two agencies have a different view on the way to tech their courses. BSAC is more in depth but requires membership of a club and you to have some commitment to diving. Whereas PADI allows more people to engage and get a taster (in generally more favorable conditions as resort diving seems to be predominately PADI) thus getting more people into the sport.
The BSAC method seems to concentrate on the essential elements as skills with "educational elements being signed off as you complete them in the course of your diving career Where as the PADA (in my perception) is primarily focused at the resort diving allowing dive centers the opportunity to gain further income if people wish to have further education or a specific experience while on vacation without necessarily spending their time in classrooms and sitting exams again.
Looking at both syllabus's my opinion based on my type of diving and the fact I can dive every weekend in a club then BSAC gives me the better way to learn more core skills and improve my diving - However if you can only dive occasionally and want to enjoy diving on vacation then the bite size system may be better way and obviously gives the dive shop extra income which they clearly need as a business.
This all said if people think they need a card to take a camera underwater than it is either the fault of the agency in the way they promote this OR perhaps over selling by some (hopefully a minority) of Dive shop or operators>