Getting all the wiser
I have done a fair deal of dive training over the years—mostly out of simple curiosity, professional interest, a desire to acquire more skills, and to be all the wiser.
Most of the acquired skills, I never or rarely use in regular diving, most of which is the plain vanilla variety anyway—that is, no-decompression, open circuit and no fancy gasses, except for the occasional use of nitrox. Keeping it simple has its virtues.