CSS 3 color module and deprecation of "system" colors

Apologies for cross posting, but: could anybody shed some light as to 
why system colors have been deprecated in the CSS 3 color module?

http://www.w3.org/TR/2003/CR-css3-color-20030514/#css-system

In my recent testing on Windows browsers, I found them to be fairly well 
supported and would posit that they can have quite a valuable role to 
play in creating accessible style sheets that match the user's set 
colour scheme / preferences (e.g. if a user has set their Windows 
environment to High Contrast, a web page can be styled to follow that 
preference).

Cheers,

Patrick
-- 
Patrick H. Lauke
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