What I see with OW classes are students who are grossly overweighted and have their octopus' dangling at knee level. I also see them with no computers or watches.
To me this just seems half-assed. If I showed up for a real dive with those same instructors with my gear configured like their OW students they'd look at me like I was a fool. So why are you teaching your students this way?
I understand that you're going to weight beginners a little on the heavy side so they can do things on their knees in shallow water, but I've seen divers remove 20 lbs of lead and still be negative and IMO, an octo is useless if you can't find it when you need it and it's full of mud because you've been dragging it across the bottom.
I think you are very right with this. Many OW students are very much overweighted so they can do their skills on their knees. That is jsut one more reason not to teach the skills on the knees.
When our group published our article in the PADI professional journal on teaching scuba without ever gong to the knees, I had to pose for the pictures. We wanted it looks like to do skills in horizontal trim as opposed to kn the knees. I had not done skills on the knees for years, and when I poaed for the pictures of that, I was shocked at how much weight I had to add to do it.