Sounds good.
There are clients of WebKit outside web browsing. A significant client like that on Windows at Apple is iTunes. I checked <https://www.apple.com/itunes/download/> and Windows versions of iTunes require a processor with support for SSE2, so clarifying WebKit’s lack of support won’t be a problem there.
That's cool!
I also want to note that Windows 7 seems dropping non-SSE2 x86 support[1]
> Symptom
> A Stop error occurs on computers that don't support Streaming Single Instructions Multiple Data (SIMD) Extensions 2 (SSE2).
> Workaround
> Upgrade your machines with a processor that supports SSE2 or virtualize those machines.
— Darin