Unfortunately I'll be repeating myself, but here goes;
Siggy, you beat me to it, FLEXIBLE, that's the key. AOS is so damn flexible. I could be wrong, but I heard game guys could easily not use ANY of the OS if it suited their needs. The machine wouldn't cry bloody murder! It makes me say, never mind "amiga anywhere", I say "ANYTHING to ANYONE"!
But wait, that's only a part of it, with everything else that was said by others here.
In fact, everyone saw something different. For me, and few people seem to have lived my vision, I freaked after desperately saving and finally buying an 8 meg ram board for my A2000, I loaded the ENTIRE OS into ram: or usually a rad: ALMOST every session. I remember playing "Black Crypt" (five disks) in ram. I still remember playing one of the Ultimas on a SNES, with LOAD TIME DELAY!
Atari and Mac aren't flexible enough, and windows, FORGET IT!!!!
Notepad on w98se is 43,000 bytes, and it's USELESS!!! IT HAS NO FEATURES!!!! It's limit is 64K files!! then you have to use wordpad, which I didn't install.
Multiple screens, at different resolutions; once you SEE that, YOU'RE ADDICTED!
I HAD a program called x-ray??, that could cycle through the screens below it, over the section you were on, or pan and scroll around it, HOW COOL IS THAT??? 1990!!!!! and you SAW the program underneath RUNNING!
AmigaOne! "Anything to anyone".
P.S. Isn't that why you bought a computer?