But really, it wasn't a 20th anniversary set list per se, at least not how you seem to be implying - where they would play "the greatest songs of their 20 year career." It was never promoted that way, and never intended to be that way.
I know, but either way, for a show being promoted as their 20th anniversary show, it was a pretty weak set list. Too many top notch and very popular DT songs were not played, and too many run of the mill songs were played. I know it wasn't a "play the greatest songs of their career" type thing, but considering it WAS an anniversary show, I think the set list was lacking. I remember getting home that night and checking the 'net to see what they played, seeing the set list, and actually saying out loud, "
That is the set list they played?" I wouldn't call it bad so much as I would call it underwhelming.
Contrast that to Rush, who did their 30th anniversary tour the year before and busted out most of their most popular songs (that actually get played live, meaning not songs they simply do not play anymore). Imagine Rush doing that tour and playing "Face Up," but not playing "2112," "Xanadu" or "La Villa Strangiato." That is basically what DT did by playing "The Answer Lies Within" and not playing "Take the Time," "Learning to Live" and "The Glass Prison." And Rush ain't exactly perfect when it comes to constructing set lists, but at least they got that one mostly right.