I didn't sea an extream advantages of XP till now, mostly I think XP is only a combination of experiences in term of programming. XP says either planning, design is useless, I just want to say, it's shit, if XP fans can't create plan and design, sure they want to abandon them.

The original of that sketch is hanging on the wall of the ThoughtWorks London offices.

(Oh, and Extream XP does put a high emphasis on design and planning. In fact so high that in XP you're designing and planning all the time, not just in the beginning of a project. I guess you must have misunderstood something.)