Yep, and I did make that connection, but decided that Apple probably correctly did it to create more simplicity. Like this, they forced makers of 'control panels' to stay within certain boundaries - although Microsoft for example just didn't want to do this. Ever seen their Mouse Prefs in OS X? (Dunno if they've changed that by now, never really used them...) The preference panel only has one button that starts an external application. I guess they really only felt comfortable with Carbon from the beginning. 
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