"compiled and enchanced from original source files"
who cares? Users want to have a good computer at the right price and do not care what has originally used 68k code. At least one of the "copies" has avoided to make the same errors as AOS (to connect too tight to one hardware-platform). That was already the problem of the old AOS and it was repeated again.
As I mentioned, some do care. AOS totally changed my life 20 years ago, got me my first real IT job etc. I want to see where AOS is and where it goes.
Without AOS I would now be a building architect instead of embedded SW professional.
There's not much on top of that to convince to get AOS4. Well... except to play with new/weird/rare PowerPC HW. (I wanted to play with PPC440 as well, because at that time I was developing SW for it at work)
btw. I doubt there is any HW dependency left from 68k AOS. AOS4 seems to get to different HW pretty ok (currently Classic, A1 series, Peg2, SAM series, with and without cache coherency). IF THEY MANAGE to get the multicore support done without breaking everything, it should prove that they have abstracted the low level stuff pretty nicely) I doubt any of the clones are easier to get (fully) on another HW than current AOS.