One can't fault the proofreaders. No one of authority has ever shown an interest in markup to define structure rather than appearance.
I'm not sure I'm trying to find "fault" with anyone except perhaps Greg. What I am trying to do is engage people in a little fact from Planet Earth which they do not care to acknowledge, namely that the books they are producing are most often unreadable by real world customers, and when they are readable are still often an unpleasant and amateurish looking experience. I can download the html, fix it, and get an enjoyable experience most of the time in a few minutes, so for most books it's far from an unsolvable problem. Some book however, use fixed layout, or quasi-fixed layout, and then they truly are hard to fix. Such a shame that 100s if not 1000s of volunteer hours per book go to waste because "no one" cares about formatting.