I only use 6-1/4" depth frames throughout my entire operation (though I keep two deep hives, just for the principle). I have no difficulties, harvesting honey, raising queens and nucs, or many of the other things that beekeepers commonly do.
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I don't know about David Miksa, but I do know that the bees don't seem to behave any differently on medium depth frames -vs- full depth frames, and medium frames are easier to lift and manipulate. I do notice, especially when I'm checking on my few full depth hives, that it is easier to find queens on medium frames than deep frames, my eye has less territory to examine and I can focus on one side of the entire frame at the same time - deep frames I find more difficult to focus on one entire side at a time.