@Franko
It's because in 16 years a lot of advance have taken place that don't require a person to know how a computer works. Everything just works, plug it in, turn it on, and away you ago. The Amiga world doesn't work that way, it's more plug it in, turn it on, guru, try to fix it, surf the net for an answer, fix it, guru, repeat process. Welcome to the '80s...
Also, the Amiga is back in the '80s in terms of user friendliness, on a Mac or a PC you don't have to understand how something works to use it, in the Amiga world you have to....
For most basic tasks on the amiga, you click on an icon and stuff happens.
Seems pretty similar to anything else, and certainly no worse than dos/windows at the time.
But of course, yes, if you are comparing a (at best) 1992 operating system with the most recent versions of linux, osx or windows its gonna be lacking accessability.