A Microsoft spokesperson confirmed the change, noting that businesses who need to shut off Store access have no recourse other than Windows 10 Enterprise. The official statement:
"Microsoft is focused on helping enterprises manage their environment while giving people choice in the apps and devices they use to be productive across work and life. Windows 10 Enterprise is our offering that provides IT pros with the most granular control over company devices. Windows 10 Pro offers a subset of those capabilities and is recommended for small and mid-size businesses looking for some management controls, but not the full suite necessary for IT pros at larger enterprises.The ability to block access to the Windows Store is typically for organizations who want more control over corporate-owned devices. This fits into the value of Windows 10 Enterprise.