Yes, I’ve read and heard the same things about locked elbows, and that probably is a real problem for some people, and may even have been an exacerbating factor in my case.

My suspicion though, is that most elbow, wrist, and caporal tunnel problems are related to a simple problem of improper handlebar geometry (width, rotation, break lever placement). And since handlebar setup receives next to no attention in discussions about bike fit, handlebar geometry is one of the last things people think to address when experiencing discomfort (even though such adjustments usually require nothing more than a 5mm hex).