I disappoint myself all the time, so that's no big deal.i will surely disappoint you at some point.
Honestly, I may have misread your initial point. It's not, "that guy is doing an armbar," that is concerning. It's how that example can be used or misused to validate one's own training model.
Simply put, it's what comes after identifying a technique, around here. In judo it's called x, and in aikido, it's called y. In budo taijutsu, it's called z. See? All styles are awesome, and can't we all get along?
I'm all for getting along, and I can agree with identifying techniques. But an armbar in bjj is taught differently than an armbar in budo taijutsu. Even different from judo. The setups, the feints, the strategies, and the execution are all going to be different, even among close cousins like judo and BJJ. The technique may be identical, but that's the least important part of the equation.
So, when I see someone post a video and say, see? Aikido/judo/BJJ works because YouTube, I'm interested in seeing if these other intangibles are present. Without that context, you don't have enough information to evaluate the video. For example, in a video where a guy does an armbar, is there enough there to know if it's BJJ or aikido or ninjutsu? If not, you can't presume it's validation of them all. That's questionable logic.
And this even more recent trend to referring to things as "like" (aikido-like) as though that's validation. Forget about it.
I think I finally am understanding. See, even the deepest, darkest cave can have a candle lit within.
You do armbar. I do armbar. They are both different, yet both reside in the set of things called armbars. The fact that we both call what we did, and what the other one of us just did, as armbars is not a quality comment on the armbars themselves. Mine sucked. Yours stretched out Tito Ortiz's arm to look as long as his legs (not a tremendous change, I grant you), but both still remain armbars.
But, if someone sees my horrible one, and goes, man I need to do that armbr like that guy, that was awesome!... but it's not... then they create for themselves a problem. For me... I'm OK with that person making a bad judgment about the efficacy of what they are learning.... as long as they're not my student (caveat). If we become concerned as teachers with everyone else's training model and pedagogical approaches (I suppose unless you are in a big association like USJA where there is a good reason for quality assurance modeling) I think we're aspiring too high for something we could in reasonable probability achieve.
And, some training models are anathema to others, intrinsically. I just had a funny thought of the training sessions in Rocky IV as applied to a Tai Chi class (like the cool videos of the old folks in the park, all moving in unison for that day's wake-up practice. Which some of those people have been doihng for going past 50 years now....). That's oil & water.
Shoot, my own, "Anyone have a question?" I say every class after showing something either old or new is anathema to some... hmm... people. I'd say arts, but that's not really accurate. Some people do not like, nor do they want, an open, questioning environment which revels in expirementation like I/we do.
You also said, "But an armbar in bjj is taught differently than an armbar in budo taijutsu. Even different from judo. The setups, the feints, the strategies, and the execution are all going to be different, even among close cousins like judo and BJJ. The technique may be identical, but that's the least important part of the equation."
But, both are still armbars, right? I think you already agreed with me on this and I just kicked a deceased equine. Judo armbar isn't a BJJ armbar, though you have to actually go to class in each to figure out the subtle differences between them, imo. But the gross generalities which cause our thoughts/minds to categorize what we're talking about as "armbar" are the same, or similar enough, for the tag to fit. That being said, a person whose avocation it is to be a martial artist is best served, again in my opinion, by seeking out other "styles" (it is why they call them styles by the way) of things like what you do, and learn from why and how they do what they do. Oftentimes, even if you don't find something outright better, you find at least some valid points with which to supplement your own skill.