There are certainly many answers and explainations to you question, so I will try to give a brief response. 1. Many
of the original design and components can no longer be made. 2. The original Amiga's do not conform to what is now known
as "industry standard" parts such as PCI, AGP, and USB, though 3rd party expansions have alleviated this to some degree.
Ease at which parts can be obtained for the x86 platform (and of course cost) is why people settle for that. 3. Modern PC
hardware such as the latest APUs, GPU/VPUs, etc in many ways mimic what the original amiga chipsets do. They offload
work from the main processor and to some degree can run independently. 4. Has much as the original hardware was
special, I personally believe much of the "magic" was in the OS. Of course, this point is certainly debatable. I also
believe OS4 does a great job recreating that ole Amiga feel.
To clarify one of your statements, The AmigaOne is compatible with a lot original software. No not 100%, but what little
it can't run can certainly be emulated. I am sure the AmigaOne owners will certainly voice their opinion.
As far as who owns what, I really don't know anymore.
I hope this helps.
C Snyder