As I was the one that brought up holes in training, I want to point out that it really wasn't a tangent, although that's what it became. It was an example. I'd like to take one more stab at explaining what I meant, because the very true observation that everyone has a hole in their training wasn't the point.
Rather, it's about one's priorities in training. We all have holes. Some martial artists and some styles encourage experimentation in a desire to fill these holes. You could argue that they all do, but I'm not sure whether that's true or not. But, we know that at least some do. Right? If push comes to shove, a choice must be made. Is it more important to you or your style that you adapt, or is it more important to preserve the integrity of the style?
If you're training in Kyudo, you wouldn't modernize your bow. A compound bow propels the arrow faster and with more power per pound of draw weight than a traditional Yumi bow. But that's not the point. Is it? Can you make the bow more efficient by modernizing it? Sure, but efficacy isn't the primary goal. And really, you could say, "I don't ever expect to need my bow in self defense." And you may be right. But that in no way makes the fact that you are choosing tradition over an acknowledged deficit. You're saying, this is more important to me than that... "I could make the bow more efficient, but by doing so, I would no longer be doing 'kyudo.'"
This isn't just "holes." It's about any other potential factors of training. Tradition is the act of transmitting a system from generation to generation. It's the function of passing things as unchanged as possible from one person to another to another. If other factors, whether it's evolution or modernization, rule sets within competition, filling holes, or anything else, is more important than the passing of the system in its entirety, you are likely not in a "traditional" martial art.
Bottom line, the word "tradition" already has a meaning. I'm simply suggesting that if we want to know what a "traditional" martial art style is, we look at what "tradition" actually means.