AROS uses Zune. MUI4 was solely developed for OS4 so that OS4 could have OWB, it was a matter of "browser envy". The idea to "backport" it to m68k was AmiKit's idea I think, I suppose it too was for OWB? Anyways, people can spend their time, RAM and CPU cycles however they want. Remember back in the 90ies, there was a strong "anti-MUI" sentiment back then, because of bloat and "un-amiga" way of doing things, and that was MUI3.
PS - great to hear that Stunzi is living his dream riding his bike all over the world still, more people here should follow his example
