I think this is more down to Apple style workflow than actual requirements. With Apple you have to do things the special Apple way because Steve Jobs said so.

I think this is more down to Apple style workflow than actual requirements. With Apple you have to do things the special Apple way because Steve Jobs said so. On Linux I am not thinking 'oh, where is my system wide colour picker and getting irate because there isn't one'. The colour picker works fine in the image editor program, with the browser add on I am covered for practically every use case. Sure I had to add the browser extension and would be stuck without it, but my thinking was to get the browser extension rather than even think to install an OS widget. I can't say that I have had a genuine need for a OS level colour picker ever. It is just not something needed. And no, just because I am not on an Apple machine does not mean I don't do anything 'creative'. With Linux there are plenty of colour pickers already out there, 'pick' is very neat as it gives you a little screenshot of the context of where you got your colour from with a sensible colour name given too (albeit not a standard X-Windows style one, so you get 'Hot Cinnamon' instead of 'chocolate').