I don't think Apple really wants you to buy their monitor for use on a PC. It's just a support headache, between the cables and graphics cards and refresh rates and gamma and such.
Everything on the product page suggests it was only designed for Mac:
https://www.apple.com/studio-display/
That it happens to work on a PC at all is, I guess, an unintentional side effect that they'd rather not even acknowledge. You can try it unsupported but it's not their problem...
They've never been good at supporting standards not invented there. Hell, ever tried to use a Magic Mouse with a PC? Everything about it feels completely off. Part of me wonders if subtle incompatibilities, where hardware works 80% of the way, is maybe even part of their deliberate strategy to introduce small headaches to the PC experience to frustrate you into switching.
(Of course OSX has its own share of frustrations too, but nothing like using PC hardware on a Mac or vice versa).