What is the meaningful purpose of "Windows Update" for versions no longer recieving active patches. (I imagine there's some bigcorp or biggov that will pay wha

What is the meaningful purpose of "Windows Update" for versions no longer recieving active patches. (I imagine there's some bigcorp or biggov that will pay whatever price is necessary to get a patch for XP, but anything earlier?) Couldn't they collect and systematically 'slipstream' every patch and fix that would exist on Windows Update into a "Final Edition" ISO? Or is the scope broader than a naive reading of the headline, and non-OS packages (drivers, third party software) were also relayed through WU?