This actually very good post and poses a question that sits in the back of my mind sometimes. I have some random thoughts about it. Mastery is term that inthink gets thrown around sometimes but is very difficult to achieve in any aspect of life much less something so debatable, controversial and left to personal preference like bass fishing with artificial lures.
Do I believe there are guys out there that have mastered some techniques? Yes I do..absolutely. But what does that mean? It means this person has the what,where, when, why, color preference, weight, retrieve speed, and adaptability to change on the go much like a wide receiver running an option route..I think a master of a bass fishing technique would have ideal fishing gear set up specifically for that technique and a back up combo that varies slightly to accommodate changes that they need to make. In a sense, a master of a technique cant just be a guy who is great at this one thing with it all figured out, to me a master (and I hate the word master by the way) is someone who is innovated in their craft, ever charging forward, making changes, improvements, and is consistently finding more efficient ways to do way they do. Example, look at Gary Klein, not only is he a jig flipping fool, he is designin jigs, and constantly pushing the industry standard.
But let's go back to basics real quick. To even get to that level in one technique, this person should have solid if not excellent basic fundamentals.
I honestly dont think I have mastered anything, I try to stay really balance but there's a couple things that are my bread and butter and I try to tend to those and keep my production and efficiency up.
Very interesting topic
But to answe the original question. How do you master anything? Time spent..practicing, studying, and taking advantage of every resource you can to get better.