It does. There's maximum of 64 threads in a processor group. This is because the affinity mask in tons of internal data structures inside NT are pointer width (so 64 bits on a 64bit platform).

Server and Enterprise's scheduler adjustments are just around making better decisions balancing which processor group a new process is assigned to at creation time.

You can read more about processor groups and the manual work by user space needed to manage them on all flavors of windows that support them here: https://docs.microsoft.com/en-us/windows/win32/procthread/pr...