Stefan Stuntz still lives? I tried to register MUI last year, the payment worked but I did not get any answer. I also sent a email and got no answer too. Hardly creating trust at me...
A basic question. MUI4 is property of Stuntz and licensed to MorphOS-Team and still in development by him?
I know of developers who maintain different sourcecodes what is not very efficient. And the problem are not the "big" differences but the small ones (f.e. CybergraphX related). I experienced that a couple of times when testing 68k applications and games on AROS 68k. It can be non-implemented AROS routines or different behavior/parameters. Often small differences can causes crashes (or at least non-working software) and are difficult to find if you do not know the different OSs. New developers from outside (who we will hopefully win in future) will not be willing to invest lots of time testing their software on different platforms and decide for one platform (they see the most potential in). Alternativ there are multi-platforms tools too who hide the differences but these tools are mostly not suited for every task. So by forcing developers to decide for MorphOS or against it could strike back on them depending on the situation.