Are you sure about this? As I mentioned, just a few days ago I had to manually download and install Intel HD drivers which were listed under "Recommended Updates"(note, the driver provided by Windows was indeed a later version of the one posted on Asus' own site...)

I did some searching and found this on Microsoft's own site:

Automatically get recommended drivers and updates for your hardware

Applies to Windows 7
In this page
Drivers and information
To have Windows automatically download recommended drivers and icons
To turn on and configure Windows Update
To install drivers and other optional updates from Windows Update
If Windows can't find a driver for your device
If Windows can’t find information about your device in Device Stage
You can have Windows automatically download recommended drivers and detailed information for your hardware and devices. This is a good way to make sure all your hardware and devices work properly.

Watch this video to learn how to automatically get recommended drivers and updates for your hardware (1:13)

Drivers and information

Windows can find and download two kinds of updates for devices connected to your computer:

Drivers

A driver is software that allows your computer to communicate with hardware devices. Without drivers, the devices you connect to your computer—for example, a mouse or external hard drive—won't work properly. Windows can automatically check if there are drivers available for new devices that you connect to your computer.

For hardware that you've connected to your computer in the past, updated drivers might become available at a later date; but those drivers aren't installed automatically. To install these optional updates, go to Windows Update in Control Panel, check for updates, and then view and install driver updates that are available for your computer."

http://windows.microsoft.com/en-us/windows7/automatically-ge...

EDIT: has anyone confirmed if the USB drivers are in fact proprietary Samsung drivers as opposed to the generic Windows drivers? I'm curious if the support tech was merely stating a contrived example or if that is an real world scenario.
So it seems pretty clear they don't install automatically and in fact not even when you install (manually or automatically) the regular crtical updates they post - which is in line with my experience over the years. The one exception might be a service pack where non-critical fixes sometimes make their way into the release (though even these have recommended and optional categories for patches which you must manually select). Ironically, despite some confusing overlap conflating the drivers installed from Windows Update when adding a new device with updating drivers to newer versions as part of the regular Windows Update patching, there are some fairly simple directions to disable drivers sourced from Windows Update for both cases:

https://support.microsoft.com/en-us/kb/2500967

While still unacceptable IMO, using this method would at least allow users to still receive critical security patches and other recommended/optional updates. It even mentions how MS works with third party vendors in some cases to insure only compatible drivers are ever installed (as previously mentioned) which is really the only acceptable procedure.

It seems pretty clear that Samsung chose the absolute worst option of ask those available, though it remains unclear as to why. Given a simple Google search yields plenty of high level info on the subject, I can't help but wonder if this has some other more concerning justification...