I agree. Beyond outright errors, such as you mention, as people grow into archery, they may learn to expand more and develop a stronger release. Best to stick to charts, spine calculators, and personal advice until one develops a consistent form.
That said, playing around with a bare shaft is fun, and people can learn things from shooting one, be they novice or experts. I would encourage anyone to have a bare shaft of any arrow they shoot regularly, and keep it when you move on to other arrows for future reference.