At least AGA was following the same design principles of the Amiga chipset, but in 32 bits instead of just 16 bits. The things that make Amiga graphics unique is the use of bitplanes, overscan, blitter, copper and HAM.
Let me ask you this question: If all of this unique hardware design is ditched in favour of something entirely different, like a 24-bit frame buffer or a chunky display... is it still an Amiga?
Not to mention that so many graphics applications would have to be either completely rewritten or use some kind of conversion (c2p, for example). If the world of personal computers was headed for byte-per-pixel chunky graphics, then at least Commodore were headed in the right direction with the Akiko chip: keep the same hardware whilst moving to a future way of utilising graphics. And even though Akiko was not readily available everywhere, there are plenty of optimised software c2p routines in use.
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