One company cannot out-innovate thousands for long-- so everything the Amiga could do in 1985, the PC could do better by 1987 with ISA cards from thousands of different manufacturers.
HAM in 1985 was great. VGA in 1987 was better.
2x 8-bit stereo channels in 1985 was great. SoundBlaster CMS in 1987 wasn't better, but it didn't take long before 16-bit audio hit the PC.
Video overlay with the A2000 was great, and carved out a niche in AV production for decades. But again, VGA was better, ubiquitous GUI accelerators like the Mach32 made windows fly so fast the Amiga could only dream, and frankensteining accelerators into a closed "complete" system was not the answer people were looking for.
Hell I had, and still have, my A2000 and remember the torturous pain of upgrading the video in it, with some apps that would only display on the built-in video because the add-in cards couldn't support the native graphics some apps that would work on both until you dropped in the accelerator file thingy and then they would only work on the add-in card, motherboard ram/chip ram/fast ram/expansion card ram/CPU accelerator RAM all of which could lead to incompatibilities or performance gotchas.
Generally speaking, you stuck in a VGA card and CGA and EGA worked. When a faster card came out you stuck it in and loaded a TSR or drivers and things worked faster. Installed Windows? Get a card with Windows acceleration. 1280x1024@24-bits in 1992 while the Amiga was outputting TV resolutions.
I installed a Picasso video card and performance worsened because I had paid for the then-astronomical 8MB "fast" RAM upgrade and whoops! video cards only worked with up to 6MB of fast ram and any configurations with more had to use segmented RAM which tanked performance. Some programs would only work with the Picasso drivers, some with the cybergraphics drivers, and others still with only EGS drivers.
At almost the exact time this article came out I moved to PC, got to play Doom, and the rest was history.