drhowarddrfine - 1:43 pm on Feb 3, 2013 (gmt 0)
Your link title is misleading. That topic is why you shouldn't use XHTML and serve it as HTML and not why you shouldn't use XHTML.
There is only one sad reason to not use XHTML and that's search engines. Search engines might struggle to find their way through your page, especially if you use custom tags or XSL. If not for that, I would use XHTML exclusively for everything on the web.