The only thing I can say is that maybe someone who knows how to apply it will post video on Youtube. My perspective comes from my own experience of what I see vs what may be out there. How many people have we seen spar and actually use Jow Ga techniques? So when it comes to Aikido, I'm thinking the same thing. There may be others out there who just haven't posted a video of them sparring.
I like this one. But unfortunately I don't know enough about Aikido to know if that's what he was doing.
if he's actually using it Aikido (in the video above, then that video gives a much different perspective than the video below.
The only thing I'm sure about is that Joint locks works, and how it's applied is going to determine reliability. I don't think it's a bunch of made up Joint locks and arm twists. I also believe that it's going to be rare to find someone passionate enough to actually learn how to be functional with the system. Most people rather mix and match systems, which is nothing wrong with doing that. It's just that doing so, may cause a person to give up on the applications of the system instead of trying to figure it out.