Secondly, there's no real advantage in using AGA vs even ocs for c64 emuation. CPU speed is the important thing here.
Although I mostly agree with you I guess Amiga Frodo could be updated to add support for c64 128 colour screenmodes and that's where AGA could come handy but even 060 is too slow to emulate c64 accurately. And on top of that I guess NovaCoder has better things to do :-)