Look, when the Amiga 1000 came out, in 1985, nobody cared about having to load a disk to boot the machine! Maybe when you saw the A1000 is was much later? Yes after the A500/2000 were out, the loading of the disk was very annoying. And as far as expansion, again think 1985. The previous machine that commodore released was the Commodore 128D. Please do not compare later technologies to earlier ones (as far as home computers go)
The A500/1200 were awesome for their time too. I agree with you on the A600, it was crap. If it were AGA, and had a viable CPU upgrade path, it would of been really cool (like the 1200), but not the way it was and it being ECS...