Your comment merges well with one slightly above from TheFlyingFish, It's that browsers pretty good at displaying stuff even when html is not to spec.

and really it's that everyone uses browsers that still display text and such on the screen even if it's broken in several places.

This could change if google decided to stop showing pages with broken html - like them killing flash big cuts at a time.

I have turned several worpress based sites into static html with one of the static html making plugins - and that turned those tools into the right ones for those jobs. I think most WP sites can be converted and be just fine, most people don't add new posts to them regularly from what I've seen.