There are different things going on in this thread.
1) Intel's chipset INFs cover situations where the drivers are generic/default OS drivers. We're talking about drivers for USB controllers and other standard mobo components for which the only drivers available are those that come with the OS.
2) Drivers from Windows Update are not generic. They are drivers that the manufacturer submits to Microsoft and that Microsoft tests and publishes. Microsoft doesn't pick and choose what appears on WU--the manufacturer does.
Sometimes the WU drivers are older, either because the manufacturer simply didn't submit newer drivers to WU or they submitted them late. (And even if they submit a driver to WU at the same time they post it to their own website, there would still be a modest natural delay.)
And then there are cases where the version on WU is substantially newer than the ones found on the manufacturer's website. Or, in some cases, the WU version is the only one available. Again, this is up to the manufacturer. They may decide to publish only to WU and not to anywhere else.
I've had devices where the ones from the manufacturer's driver page is much older (and problematic) than what's offered via WU. It's absurd to make blanket statements about drivers on WU--sometimes they're identical, sometimes they're newer (and better), sometimes they're newer (and worse), sometimes they're older (and better), and sometimes they're older (and worse). It's something that needs to be evaluated case-by-case (and often version-by-version), and if a version on WU is indeed problematic, the problem isn't with WU, but with the manufacturer who made that driver and submitted it to WU.
3) Finally, I remain skeptical that any system assembler would have enough technical know-how to modify a GPU in such a way that it would require and benefit from custom GPU drivers, and I reject the notion that OEM-specific GPU drivers have any "special sauce" compared to what you get direct from AMD or nVidia. This is really more of a case of the OEMs being control freaks.