We amiga developers use better cpu than 68k because 68k is too slow.
Making software for real 68k is not interesting because this crap has 486 level performance.
Amiga is hobby and hobby has to be interesting.
We amiga developers will not resign from decent C compiler.
And gcc is one and only decent C compiler that generate code for amiga.
It is simple - code generated by gcc is too slow to real 68k cpu this means real 68k cpu is crap and need to be replaced with something better.
It may be any cpu able to work in 32 bit bigendian mode due to integration with the old 68k software - all 32 bit bigendian.