Very nice post, seems to make sense, I think the Amiga OS was ahead of the time in 1987-1990 (maybe even later) and it should be respected for that.
Of course an OS designed in 85 cannot offer the same features as a modern OS, that would be crazy

It was obviously very advanced when it was first released in 85 but in subsequent years Commodore didn't really do much with it apart from minor enhancements (same as what they did with the hardware!). Some serious effort was put into 3.9 (maybe 3.5 as well?) but that was still based on the original 85 code base.
Personally I like using Amiga OS 3.9 because of the simplicity and 'retro feel' but it does feel very week in some areas (like file management for example). With a few minor updates it could be improved to make it even more usable (integrated file management, memory protection etc).
I wouldn't actually want to run AmigaOS 3.x or even 4.x on my PC, maybe I'm in the minority here but I'm quite happy with running Windows on my PC and using my retro hardware for my retro OS fix. Windows 7 isn't perfect but it's good enough to open my browser and run my Compiler, I don't really need much more from an OS these days.