DrDoc - 7:42 pm on Apr 2, 2006 (gmt 0) WITH the two, however ... yes, the there are certainly benefits to be had!
Pageone, just remember that W3's statement is said in the light of using the XML prolog and application/xhtml+xml mime type. Without the two, there is no "entering the world of XML with its benefits" whatsoever. XHTML without the two is not XHTML. It is HTML 4 in quirksmode.
XHTML family document types are XML based
WITH the two, however ... yes, the there are certainly benefits to be had!