I agree. Something I might throw in for the reader is an article like: http://immike.net/blog/2008/02/06/xhtml-2-vs-html-5/ (I have no idea on how credible that is; however, it seems to give some interesting information on the matter)

so he or she understands more about the different "html"s so to speak. (But then again, this is ycombinator....)