It it simple.
Many years ago Amiga OS API was made in cpu dependent way.
Apps peek and poke into system and other apps and excpect data to be in 32 bit big endian format.
CPU may be changed, but only to one that support 32 bit big-endian mode.
Some idiots do not acccept reality, and thinks that if they attack enough long powerpc and Hyperion reality will change.
Of course it will not happen, old apps do not rewrite themselves in a magical way.
The only way to go further is to accept the reality by red, terminilis, olaf Schickelgruber and others.