Windows 10 has Miracast built in and has encouraged wifi drivers to support it. Miracast is built on top of Wifi Direct like most of these other p2p tools. Windows also has a hard to find "AirDrop"-like system, but between having no mobile devices anymore and incompatibility with Google and Apple's proprietary systems no one thinks to use it (because it's mostly just useful between Windows devices and at that point you probably have older tools like file shares that perfectly cromulent rather than worrying about physical proximity).
A lot of these things also don't get explored as much as they should be because the APIs are in the WinRT side of the fence and Project Reunion is only just now opening WinRT to a lot more classic Windows devs.
So Windows doesn't have "nothing" here, it's just trapped between rock (Apple) and hard place (Google).