In all seriousness, the study I cited was for a professional racer, and was designed to increase his efficiency at 90+ RPM cadences. So, taking that into account, you don't really have time to pull or lift a foot when spinning that fast or faster. This whole thing is about efficiency, not foot retention. I would imagine most people would see just as much gains in efficiency with toe clips if they learned proper technique. Nobody is going to argue clipless pedals retain your feet better than anything else, but saying they make you more efficient is marketing hype. Better technique makes you more efficient.

I could go on and on about it. No matter what I say, demonstrate, or try to prove, there will be people who still insist they make you more efficient because you can pull up, which is pure speculation. I will continue to insist under normal pedaling conditions (not including bunny hops, etc.), you can't pull up with enough force to make a difference, and therefore they are no better (efficiency-wise) than toe clips. I will concede they are more convenient while riding (as well as impractical when not) and better at general foot retention, but I never disputed that to begin with.

That's just the way it is. We can agree to disagree. Can't we all just get along? This isn't the 41.