[amiga386]

I think you're missing the elephant in the room. The IBM PC existed. That was it, that's all that mattered. Nobody got fired for buying IBM. Every computer for "business" collapsed because the IBM PC was here.

Macs only survived to the 1990s by hiding from the PC in a desktop publishing niche. Amigas and Ataris survived as games machines with multimedia capabilities. An Amiga that could not run Amiga games would basically be a Sun workstation. Businesses wanted IBM PCs.

Also, the "compatibility" was a two-way street. Amiga games banged the hardware directly and did amazing things on hardware of the time because of it, but that meant hardware-level compatibility for anything which came next otherwise it'd be the Amiga that couldn't run Amiga games. MacOS software was told not to touch hardware directly but go through the OS, and they did that, and thus all MacOS software was slow and ugly, and Apple still jettisoned compatibility anyway once they moved into the 1990s and started changing underlying hardware to PowerPC.

There's always the hypothetical that Commodore could have continued, but what really got them was that the nature of games changed. 3D was in, and they were still pushing 1980s arcade machine tricks. They weren't even thinking in that direction when along game Wolfenstein and DOOM pushing chunky pixels to VGA mode X, and the Playstation was just around the corner. I don't think just having a faster CPU, "VGA" and trying to appeal to business would have cut the mustard.