For one, you can claim real Amiga cred there -- doing things the Amiga way.
Doing everything by the processor is Amiga way.
For 20 years, since the time when some lazy morons from Commodore left a 16-bit access to the bliter. So that the AGA blitter was slower in some operations, than 68020, and much slower than 68030.
You're not just a PC with a PowerPC CPU and some VGA chip trying to make the claim of being an Amiga.
If you do not like the idea of the Amiga as a PC with a different processor than the x86, there was a time when you could change that.
Why, not in 1991 ?
You could add 16-bit (65536 colors) chunky mode to AGA, when you worked on AGA.
Since this was not done, the AGA chips were crap compared to what was in 1992 in PC, Mac, Atari.
Because the Aga chips were crap, the external graphics card based on pc chips were in Amiga absolutely necessary.