If properly applied there's no reason PADI standards can't put out a well rounded "recreational" diver if said diver choses to practice what is learned. ...A recreational standard v an arguably professional one.
There are differences between the standards of the recreational certification agencies. One area is the requirement to complete a rescue of a sub-surface victim prior to certification (or not to). If you believe that a diver can act as a responsible buddy without this skill, it's not an issue. If you feel that a buddy requires this training before s/he's certified, that would be a valid reason to believe that the diver would not be safe to certify.
The standards of any agency are what they are. Each agency may look upon an instructor adding to course content differently. If you're teaching in vacation land a diver requires X, this amount may or may not be sufficient if the instructor is teaching that same diver in the North Atlantic. What is sufficient in one location may be insufficient in another. If the Agency allows content to be added/modified to the the training program, there isn't a problem. If it doesn't, then it's reasonable to assume that the course may be insufficient for local needs.
As Thal has already eluded to, many of us may be guilty of not adequately explaining our position. CMAS and ACUC empower their instructors to add whatever information and skill-sets they deem reasonably required to ensure diver safety. They may modify the training program (upward) and add content. They take on the liability for doing so, under the scope of what is reasonable and are insured to do so.
For example, as local waters here have high current and tidal exchange, I require my students to surpass the minimum swimming requirements that are outlined within my agencies training standards. CMAS and ACUC encourage me to do so. What is the current position of NAUI and PADI on this?
As I understand NAUI swimming requirements, the instructor may increase these requirements at their discretion. Can PADI's in-water requirements be increased by the instructor and the new requirements be
required for certification?
I am sincerely asking this question, as I am of the understanding that with PADI, a person who can not swim, could pass the in-water evaluation and may eventually be certified. Is this correct? I would no doubt be held to be negligent in-case of an accident given local conditions, if I allowed a weak swimmer (or non swimmer) in the water here.