I was reading the manga like everyone else until vol 19 and then for some reason there were no more chapters for some time. I kept looking everywhere for new chapters just to see that the vol 19 that I read about 2 or 3 months ago was the LAST!! FINAL!! END!! I was like huh?
For me it seemed totally unfinished or maybe CLAMP couldn't think of anything and finally dropped xxxHolic. It's like Kishimoto finishing NARUTO after he saved konoha from pain and saying that he'll protect konoha forever. WTF!!!!
Yuko didn't come back and Watanuki replaced her, so was the whole story to train Watanuki to become the shop owner? I geuss so.
I still love xxxholic but for me it doesn't seem like CLAMP finished the manga, they just dropped it and I'm probably not gonna read any other manga from them. It might just be me who didn't like the ending though.