I am not saying people do not need to learn. I am saying if they have been trained properly to begin with they should have all the basic skills needed to work this out on their own with a little advice.
Most entry-level courses are 4 dives. During those dives, the student has a vast learning curve - predominantly occupied with practicing contingency protocols, gaining a basic operational familiarity with their kit and developing the rudiments of situational awareness. Buoyancy, trim and weighting are squeezed in there also - but not the total focus of the dive, nor the product of many 'in-water minutes' of rehearsal.
Without wanting to degenerate this debate into a cronic 'OW isn't long enough' diatribe - can we agree that,
as it stands, most OW courses do not offer sufficient training or focus to enable 'the average diver' to achieve a
refined and precise level of buoyancy control?
Therefore, the a newly qualified diver (who does not have access to a mentor) has the opportunity to conduct
specific, measurable and focused training on buoyancy/trim/weighting - and this represents the most efficient method of developing
refined and precise skills within a limited time-scale and minimal budget.
100-200 dives? You only need one dive, in the environment you are going to be operating in, not in a pool.
That obviously depends upon what standard of 'refined and precise' you are using as a benchmark. I doubt that you are envisioning the same standard as what could be expected as a result from a focused training clinic/course with a capable instructor.
I've been diving 20+ years... and still find that I can make improvements to my precision skills...and still practice such skills regularly.
Where exactly are you drawing the line at 'no further improvement necessary'?
I'm getting the gist that you're under-estimating the goals and outcomes of the sort of course being discussed.
I think we can all agree that this needs to be done in the water. The question is do you need someone to hold your hand while you are doing it?
It's not a case of having someone "hold your hand".
It's about the benefit of effective feedback and having direct access to transferable experience.
If nothing else, it's a 'road map' to further development on one's own. As you say, it is "in the water" that counts... and that 'road map' needs to be a tangible in-water thing also.
My opinion is that most people do not.
My opinion, based on 20 years of diving - having encountered 000's of divers or varying experience - is the opposite.
IMHO, most people primarily benefit from being taught/shown - rather than entirely 'working it out for themselves'. Especially where efficiency/speed-of-learning is considered. Not just in scuba... but in any pursuit, academic or practical.