The AAA would provide reasonably good performance using todays technology but there are parts that are outdated and parts that are missing compared to what is expected today. It's much cheaper to work in an fpga than to create a custom chip too. The Natami route is the proper way to do a modern AGA/AAA. The Natami is not quite AAA but it is a much more flexible and compatible way of seeing what a more modern Amiga could do. AAA would have been a compatibility nightmare for those that liked their old hardware banging games.
