Going to PPC was a rational decision at this time.
In their time the 603/604 chips looked like a possible good path for the future.
For the AMIGA the change from 68k to PPC gave a different computing "feeling".
To me AMIGA can be defined as a nice combination of swift and simple OS.
On AMIGA their are no huge abstraction layers - their is no complex memory protection.
This made tinkering with the hardware fun.
Also the 68k Assmebly is very powerful, very flexible and easy to read.
My experience with AMIGA was that with a few lines of relative easy to read assembly you could do a lot.
With a small number of 68k ASM you could code a Star-Field demo, or a Sine-Scroller....
This was fun and easy.
The PPC made a big cut here.
The PPC asm is much harder to read and often you needed 4 instructions on PPC to do what you did with 1 68K instruction before.
So this nice combination of simple OS with easy to read ASM got kind of lost with the PPC change.