iMessage + FaceTime = iChat?

With the upcoming "iMessage" app in iOS 5 that allows all iOS users to text message to each other, there have been some rumors. AppleInsider reports that iMessage will also be available in OS X Lion, via iChat. But shouldn't Apple just combine iMessage and FaceTime into iChat? They're both great, and companies like Skype, Yahoo, and Google are all combine their voice, video, and text chatting services. Why doesn't Apple do the same? I also think the "Apple ID linked to your email" thin in FaceTime is stupid. Allow people to make a "FaceTime" account with a username and password (or an "iChat" account in this case). I love apple, but I hope all of these services will soon come together.