So that we can access the correct device IDs.
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The EA launcher uses WMI to query system information to tie licenses to particular machines. It expects that a video controller's PNPDeviceID will be valid (i.e. something under CurrentControlSet\Enum), which it no longer is since we stopped using DXGI in d511872a3d0dce5148d23ce5cbf80c989d484b26 / !7450. That information is available from setupapi, which is presumably faster than DXGI (speed was the motivating factor for !7450 - see the original bug https://bugs.winehq.org/show_bug.cgi?id=38879).
I'm all ears if there's a better way to associate the devices under CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318} with those that setupapi reads from ...\Enum, or if there's a way to get the stuff that's in ...\Class out of setupapi (e.g. the RAM and DAC type).