Sure. I think I've mentioned this before, but in one generation without application, the quality of skill will begin to deteriorate. It's not about the quality of the content. It's about atrophy of skill. Let's take MMA as an example. MMA has a clear application. Let's say I am an elite level MMA fighter. I have a lot of skill and a ton of experience. I am well qualified to open a school and teach students. But I have a change of heart. While I want all my students to be skilled... I don't want them to fight. I discourage them from competing, and limit sparring to within the school only.
So, one generation, I have my best student... trained him as best as I can to do all the things I can do. He's pretty darn good, too. But he's never competed as a grappler or as a striker. Do you think he will be as effective as me? I don't, though if he decides to apply his skills, he may catch up pretty fast.
Now let's say this top student of mine doesn't ever apply his skills, and instead decides to open up his own school, teaching others everything I taught him. He doesn't have any experience of his own, and so he is relying entirely on what he remembers from me. The point is that it's not the material. It's the lack of individual experience. Because when people actually do things, they never do them exactly the way they were taught. They start with the lessons, and then figure out how to make those lessons actually work, which always leads to some degree of personalization.
And so it goes. This is TMA. This is why I'm not at all surprised when I see videos like the WC videos being shared now where individuals are identifying venues in which to apply their styles and pretty quickly developing actual, functional skill. It's the training model that's flawed, not the content. The flaw is that "traditional" styles intrinsically value fidelity over everything else, and fidelity is almost always at the expense of efficacy.
Speaking of food, this reminds me of the Post Roast Principle:
The Pot Roast Principle