Both have integrated interpretive 68k emulation.
So in other words, MorphOS and OS4 are just as dependant on emulation as AROS. The method of integration might be different, but the use of emulation is still there. Do wish you wouldn't try misleading people on this, Trance and Petunia might be just the names for the JIT interpreters but considering the context Forcie was clearly trying to get across that MorphOS and OS4 use emulation too, which is clearly true by your own admission.
That remains to be seen. There sure are challenges getting the described method to work correctly.
There are challenges in any development, especially when implementing something fairly new. Let's remind ourselves of what Emumiga sets out to accomplish:
Emumiga is a Motorola MC68000 emulator and a system interface proxy for AROS. Our goal is to run AmigaOS 3.x applications directly in AROS without emulating the Amiga chipset and without any 68000 Kickstart ROM.
http://emumiga.com/about/Sounds similar to the transparent API calls that are used in OS4 and MorphOS to me. Are you saying that something that already exists on OS4 and MorphOS is impossible to implement in AROS, and if you are saying this why do you believe it?