There are plenty of times when one forgets to do something that is known "by heart". We all try to be 100% conscious at all times, but we all make mistakes too. Briot's article is a reminder of basic principles. I am at the bottom of a steep learning curve in technique and art, and do need a kick in the butt occasionally, in order to shift from the "how" to the "why" of a photograph (and back again to the "how"). The "10,000 hours" value of just getting out there and shooting is that operation of the equipment, dealing with a variety of field conditions, and post-processing can become "second nature" (habit), and high quality photos can be produced from every shoot. Art results from exercising curiosity and reflection during those "10,000 hours" - some people do so, some don't.