We just completely redid the design of our site and barely touched the HTML other than the top nav, and that's mostly because the content changed there, and the

We just completely redid the design of our site and barely touched the HTML other than the top nav, and that's mostly because the content changed there, and the changes were mostly deletions. In my experience a lot of developers solve problems using HTML that could be better solved with CSS and a sprinkling of Javascript, because they don't know the DOM or CSS well enough. I think that's what most often leads to the situation you described.