They might not be calling it CocoaTouch but it's all Cocoa. Apple wants everything Cocoa. I am happy about that too because I won't develop in anything else. I'm Apple all the way and don't use any software that is multiplatform (Windows like) if I can help it. Made for Mac ummm \ iOS by true Apple gardeners is the way to go IMO.
As for the cursor being less accurate, it is all the time. Not a bug. Apple is going the way of Touch, even on the desktop OS and they purposely increased the bounding box to accommodate fingers but the overlap in the UI of the curser suffers now from it. I need to get use to hitting the point with the cursor because since 10.7.3 it's different. It's not a biggy just annoying for me because I use a mouse exclusively.
1) Cocoa was around long before Cocoa Touch. Both are object-oriented APIs. One for a system that uses mouse pointer and the other for a touchscreen.
2) I don't know of a single frameworks in Cocoa Touch that was brought over to Cocoa. If you know of any please let us know.
3) I don't doubt that it's "all the time" considering this beta only dropped on Thursday, but I am experience this bug.
4) You having an issue with your cursor is not evidence that Apple will be removing the cursor to make all Macs touchscreens. It's a silly notion in so many ways.
5) Ah, so you're saying it's an issue with Lion. An issue that you think is proof that Apple is ignoring the drivers and UI for using a mouse yet has absolutely no touch-based Macs on the market. That makes even less sense than saying it's a "feature" of ML.