Ubuntu lost sight of their main goal when they decided to go so far away from their base of Debian. Their main goal was an up to date Debian with the latest Gnome every 6 months. Then because they judged 3.0 crappy, they decided to go in another direction, which is actually more of a waste of time. At least Gnome had a valid reason for being created when KDE was already out there. Different strokes for different folks I guess.
But did you also take into account that the port to m68k architecture makes things more stable and better code because it has to be compilable across multiple architectures? Yeah, that's a waste too.
Besides, you keep focusing on "Ported to Amiga." when it's actually a port for m68k, which means anything that uses the m68k platform can utilize Debian.