I think that you're misunderstanding me, Chris. I'm not equating experience and expertise. I'm suggesting that experience is an essential component to developing expertise. You cannot become an expert in something with which you have no experience.
Except, Steve, you have been equating them throughout the entire thread... starting with the idea itself of experience being required for expertise (part of the OP). From there (as you didn't definitively pick a side in your OP, leaving it open to debate and discussion), post 46 has you commenting that Tgace's post gets "To one of the key questions" you're asking.... stating that "in boxing you train to box...." and then asking "is any school really teaching self defence, if the students never defend themselves?". It's been a constant underlying thematic concept of the whole thread, experience = expertise, lack of experience = can't be an expert. And I'm saying that it's not even as clean-cut as you're making out here.
You can be an expert without experience (say, in sword fighting if studying Iai, or defending yourself against a lethal threat, if teaching self defence, and so on), and you can be experienced without being close to an expert (at handling violence etc). It's not an essential component... it can certainly be of great value, but that's something different entirely. For example, my favourite story of my application of self defence involves absolutely no violence whatsoever... and, if it had come to violence, that might be considered a self defence "fail"... so is that experience at defending myself, or not? Does it show a higher level of expertise, or a lower one? Or is it actually not indicative one way or the other? I mean, I used absolutely no physical skills taught in my school... especially not the traditional stuff....
So, then, the next step is to further define "experience." I think many martial arts equate training to experience. You seem to be doing this very thing. While training can prepare you to a point, as has been amply demonstrated in this thread through multiple examples, it is no replacement for actual, practical experience.
No, I'd disagree with that as well. Training IS experience, the question becomes experience at what. Additionally, it is a replacement (well, not actually a replacement, it's more an analogue when done well and properly, a true representation... it doesn't take the place of a real experience, it is one) for practical experience, as it is practical experience. It's just practical experience geared towards a certain aim or goal. This really isn't that easy to explain, but if your training isn't a real, true representation, done in a way that replicates and creates the same conditions while allowing the goal to be achieved, then get a new school, or a new approach. If it's so extreme that it's just pure chaos, and no real goal can be achieved, then the "training" isn't working. And, if it's so easy that the same conditions (which are more to do with internal reality, rather than external, when you really understand it) are not created, then the "training" is just calisthenics. This is what I'm talking about when I talk about kata training, by the way. It should always be real. Even when there isn't a "real" opponent.
I'd also say that there has been nothing in this thread that has "amply demonstrated" anything of the sort, for the record. All it's told me is about some lacking training approaches. In fact, looking back over the thread, I can't find any examples of anything of the kind... some approximations, but that's about it.
And notice that I'm not saying that all training is the same. Some is better suited than others for different applications. Learning iaido won't help me in a BJJ tournament, for example. And some training methods are more effective than others. But in the end, no matter how good the training is, without ample real experience, all of the skills remain theoretical.
Actually, Steve, speaking as someone who has trained in BJJ, and does train in Iai, you might be surprised as to how much it might help you...
But to get to the crux of all of this, I think the wrong equation has been made from the very beginning, and that is that "expert" equals someone who can apply the skills of the art, while ignoring the context of the art itself. I've said many times that I don't believe any martial art is designed for (modern) self defence, so to insist that an "expert" is someone who can, or even has applied it in self defence is, to me, completely besides the point. An "expert" is someone who knows a subject deeply. That's it. So, even if you've never been in a self defence situation, if you know your subject (martial arts, your personal art, self defence, whatever) deeply, then you're an expert. If you've "done it" (in this case referring to having defended yourself against some form of assault or attack), then you're "experienced". You're not an "expert" based on that. As a result, the idea that "all of the skills remain theoretical" is, firstly, incorrect, and secondly, irrelevant. You might as well say that a studied and skilled chef only has theoretical skills until they've fed 350 people at a sitting in a busy restaurant.
I think that's the real issue. The very premise of this thread is taking a false approximation of what being an "expert" really is. The OP seems to make a distinction between "doing the art" (ie, training, learning, developing the contextually correct and applicable skill sets, and employing them in the way the art is designed, within it's context, which for a sport art includes competition, but for other arts doesn't, yet at the same time, doesn't even necessarily include free-form, sparring, self defence, or anything else) and "employing the skills"... when both are really "actually doing it" (gaining the experience, depth of knowledge, and skills to be considered an "expert" in these forms). Whether it's employed outside of class or not is irrelevant.