Thoughts on the whole XHTML/HTML5 affair

My favorite bit (even though I, myself, find it a bit silly):

Which brings me to the reason why I use XHTML: The validator enforces my preferred coding standards for HTML – lowercase elements, quoted attributes and closed elements. That’s it. Not much really. I know it’s marketing XHTML rather than technical XHTML. I don’t care. Or rather I do care, I just make a conscious pragmatic decision based on a small personal advantage. I’m both pedantic and like having a tool chain which enforces that, XHTML suits my style.

Why do so few blog posts have a byline? Why do I have to go digging around to see who wrote the damn thing?