I agree with all points by Bruce Abbott, except the last one - a chunky mode to spoil the fun would have been great with the improved DMA speeds of A1200. I even called up a Commodore-Amiga representative to tell him so back in the day - before AGA. Ah, the innocence of youth.
I also agree with Karlos, to get back on topic, which is: the Amiga didn't get a HW chunky mode. It's a fact. Now, how can the Amiga do even greater things?