@amigadave
Back around when Amiga officially died, there were an effort made to create a new system to evolve the Amiga independently of Commodore/Escom/Gateway/Etc. The people behind this effort were many of those who made/kept Amiga really useful during the later part of its life time, by giving it PowerPC/PowerUP, retargetable graphics, retargetable audio, USB, a modern GUI environment, etc, etc, etc. Developers were hired, stuff were licensed/bought, and the result was MorphOS (and the Pegasos) which built on all the best Amiga standards and technologies available, and continued evolving from that.
When the Linux game porting company Hyperion a few years later was about to give their shot of doing the same thing, they essentially had to settle with much of the leftovers stuff that MorphOS hadn't already snatched. To remedy this, they started massive FUD campaigns against MorphOS and its technologies to rally their followers, and MUI has always been one of the targets for this. You even see examples of the results from this in
this very thread. They (both OS4 core developers (like the Friedens) and others) have made it perfectly clear what they think about MUI over the years, there can be no misinterpretations. To put it mildly, they don't want it, they don't need it, and Reaction is so much better so *this* is what OS4 is using.
MUI was never free, money has been invested by Genesi/MorphOS into MUI development and to have it in MorphOS, it's being developed by the MorphOS team, Stefan Stuntz is considered a core MorphOS developer, MUI is tightly integrated as a central core component in MorphOS, nothing like the third party add-on it was back in the days. MUI4 is one of many clear and obvious competitive advantages of MorphOS, one of many easily perceived reasons to use MorphOS instead of OS4. Anyone persisting in using OS4 (for whatever reason) must learn to live with the limitations of the OS4 standards and technologies (after all, those technologies and standards are the reasons you choose it in the first place, right?), anyone wanting the many benefits of MorphOS should simply start using MorphOS, it's as simple as that!
@Krashan
nothing stopped them to make it compatible with 3.8.
I didn't know that it was? In full?
Edit:
I found this page:
http://aros.sourceforge.net/introduction/status/zune.php