Because Facetime isnt iChat. iChat is more tied up to textual ways of messaging. Facetime is just that, face time, no configuration video messaging. This is something that is very different than iChat, no account needed of any sort to call someone else and video chat with them. If you are looking for a more traditional account based video chat system, im sure there will be a developer out there who will use the API's to integrate it with AIM (which is what iChat basically is...)
Originally Posted by DJNYC
Guys, FaceTime, is what this phone is going to be about, and every news story on every network, when they talk of the new iPhone, will say something to the affect of "Want so FaceTime, well Apple's new iPhone" blah blah blah. It's named that for marketing purposes kids, no other reason. Yes people do know iChat, but in your head you say iChat, you think Mac....FaceTime, you'll think iPhone. Its just for marekting and buzz, nothing more.