while I agree with you in principle, I disagree on the point that a bokken choice is not important. You mentioned the analogy of a weapon being an exercise for the mind, so let me extend on that analogy, if you will. When exercising, would it not be important to have proper equipment? Sure, you could build your biceps with pushups, but get a new exercise machine and you can work your whole arm with the same effort. And what if you're using the proverbial workout machine, only to find that it breaks because it was poorly made? Not only was it a waste of money, but you could have injured yourself and now must find another way to get that exercise... which isn't always all that bad.
Food for thought, I spose...