There are a several problems with the mentoring approach:
(1) While there are enthusiastic divers who want to teach that enthusiasm generally fades after a period of time, especially if they are doing it gratis.
(2) There are loads of newish divers with 30 to 50 dives who think they know much more about diving that they do, and they will become the instructors causing a downward spiral.
(3) Who is going to set the standards with this approach? Many of the arguments on this board are about standard or the lack thereof.
(4) Many if not a large majority of the potential students out there want to get in, and get out, at minimum cost. You can bemoan the lack of skill that results, but the commercial agencies are filling the demand that is there. And the bodies do not seem to be stacking up.
1) If you want to mentor, mentor. If you get tired of it, stop. I don't see how this is any different from being a professional instructor, except in that pros often get to do fewer "for fun" dives than non-instructors, which could arguably lead to them getting burned out sooner than mentors.
2) Again, this is different from the current instructor model how?
3) If I were going to mentor non-divers in the OP's non-litigious environment, I'd set my own standards. That they may be inconsistent with the standards set by others is not something I would lose sleep over.
4) I wouldn't train people who were looking for that kind of instruction.
Mentoring is a good method of teaching but the problem is that a single mentor may not have access to all of the new information available, current advancements in gear or new teaching techniques.
If (for the sake of argument) I taught someone to dive safely using the techniques that allowed me to dive safely 15 years ago, what's the harm?
I see three goals in certification:
- Trust between divers: as a diver, you should be able to trust the certification and do a first dive with a new buddy being confident he can handle himself.
- Operation planning: a boat operator or an instructor needs to know what level of service a diver will need. Experienced divers are happy with a spot on a bench, beginners may require a very detailed briefing, assistance with gear, getting in and out of the boat and sometimes a guide. Certification in its current state seems to help there (?). This benefits all divers, not only the operator, as a couple divers monopolizing all the crew degrade the service for everyone else.
- Operator moral (if not legal) responsibility: it's not fun to hand someone gear or gas and see the accident report the day after. To some extent, this is protecting the diver from himself, but although it makes me cringe I can understand that a shop prefers to have a 'no card no gas' policy than taking the time to assess unknown customers.
1) I believe you should also be equipped to evaluate the competence of a potential buddy, and to make a judgment on his or her suitability as a buddy without seeing their card. Based on my personal experience, a C-card isn't much of a guarantee that a diver has a clue what they're doing anyhow.
2) See #1, and if you want to know if someone needs help, asking is a time-honored method.
3) Current social mores aside, I don't believe it's the operator's responsibility, but that of the person asking for the fill. I believe the operator's responsibility is to ensure that the gas is delivered safely and as advertised. What is done with it when it leaves the shop is up to (and therefore should be the responsibility of) the buyer.
In light of the original poster's question:
First let me say that I'm a big fan of mentoring. The only issue I see is that in some cases, the mentor may very well be a master of what they have learned and a good teacher. However, if the teacher/mentor was never exposed to some aspects, how would the be able to pass them along?
They wouldn't, just like instructors today. You can only teach what you know (or, God forbid, what you have a cheat sheet for).