There are drawbacks and quirks to any software system, and no matter how carefully designed Windows is it has more than just Microsoft fiddling with it. If we were locked into only one video, audio, i/o, etc. chipset and programs limited to only a couple megs of ram and floppy discs things would be very different.
This is how Apple computers potentially are more stable. I say potentially because a friend of mine has had more crashes and problems on his mac laptop than I have had on my xp laptop, my wifes 7 laptop and my xp desktop combined.
Amiga os increased significantly in size and complexity from os 1.3 to 3.9 and if it had been updated another half dozen times would likely have rivaled xp in complexity and problems.