Indeed. This is just Apple's usual tactic of eating their own dog food, the same way that Finder used to be a Carbon app just to demonstrate that Carbon was via

Indeed. This is just Apple's usual tactic of eating their own dog food, the same way that Finder used to be a Carbon app just to demonstrate that Carbon was viable at a time when classic Mac OS developers were hesitant to move to Mac OS X, this despite having Finder written in Cocoa to start with means we wouldn't have needed to wait for Apple to port to Cocoa much later.