I've been debating about whether to form some sort of response to all of the XBL discussion going on in the www-style mailing list. But, there's already enough discussion by numerous other people. The guy who is against XBL doesn't seem to have much support, likely since he doesn't have much proof of his claims.
Or maybe it's because of the funny things he says:
I inherit from my father a very abstract brain. I work very well in multiple dimensions.
Apologies in that I violated my promise not to respond to you, but I think this clear statement of our disagreement will clarify for the list all the verbosity we did.