My point was entirely about accurately tracking gas at every stage and not to be reliant on
some arbitrary figure made up from normal + a bit, just because they are students.
Based on my nearly 20 years as an Instructor I agree with you and it seems you do tooBased on my nearly 20 years as an instructor I would say anything that reduces stress would be a positive and not worrying about running out of gas would make them safer and more importantly enjoy the dive more and likely to continue. The generally pathetic retention rate of new divers by the industry shows that the standard swim around till red (50b) and go up isn't doing it for most new divers - perhaps a rethink might help??
Quoting 50bar limit is no different then quoting 20lpm, both are artificial numbers that might
be sufficient, but for some dives/divers might not and knowing if those numbers are right for
real on that dive would make dives in general much safer.