Re: I feel retarded
"Linux and other Unixes have had extensions"
That's part of the problem - fine grained security control is an after-thought - not built into everything from the ground up like in Windows.
"From the earliest days of Unix, setuid provided a way (albeit with its own problems) to execute tasks requiring administrative privileges without using an admin/system level account."
Not the same thing at all. For instance how would you control rights to different functions within the same executable?
"Despite your false claim that Windows has an advantage in this regard"
But it is massively superior in this regard - see the above.