Yeah, really. That's a hard mistake to make.
CCS is aimed at a younger or more family-oriented demographic, because of its overall cute factor and the lack of graphic violence. Let's also not forget that in the world of CCS, the lack of global and/or terrestrial conflict is conspicuously absent. No war, no violence, no world hunger, no beggars in the streets, we barely ever travel out of Tomoeda... it's a very innocuous show. Why? It was written for kids. It just happened to also appeal to an older audience, because of its deep character development and intricate storyline.
Tsubasa Chronicle is aimed at an older, more action-oriented audience (you know, like DBZ), since it's got a heck of a lot more action, a more serious storyline and personality, and less quirky cuteness. World-wide conflict is more apparent (the war concerning the feather in the colonial world, the dictatorship and Chun Hyang's rebellion in Koryo), and let's also not forget that Tsubasa Chronicle deals with a very serious matter: death by murder. In CCS, the only people who died were because of passive diseases or other things, and they don't even do it on screen. In Tsubasa, people die at the hands of others or are faced with death very frequently.
When it came to Tsubasa, I think CLAMP simply wanted to write a character that can kick ***, take names, and be l33t 24/7. You know, like a typical action star. But even Pierce Brosnan's, Tom Cruise's, and Vin Diesel's characters have more character growth than Syaoran, and they're supposed to be action kings.
They better make Syaoran a little more lively, especially after the revelation of such a surprising plot twist. Same with the annoyingly hapless Sakura, once she gets her stunted memory back. If they don't, I'm really not sure I'm gonna continue watching, because I came for Syaokura and I haven't been getting it.
Also: Yes, Tange Sakura is retired as a voice actor so she can prolong her singing career, but who said old actors can't make recurring cameo appearances? Look at Marlon Brando. Not even death is keeping him from starring in new media.