Even if organizations are not using IPv6 in an Intranet or widely yet on internet — the guidance is to “prefer IPv4 over IPv6” & to “keep IPv6 always enabled”. Otherwise, networking may not work as smoothly.

https://support.microsoft.com/en-us/help/929852/guidance-for-configuring-ipv6-in-windows-for-advanced-users

It is common for IT administrators to want to disable IPv6. This is often because of some unknown, networking-related issue, such as a name resolution issue. Important Internet Protocol version 6 (IPv6) is a mandatory part of Windows Vista and Windows Server 2008 and newer versions. We do not recommend that you disable IPv6 or its components. If you do, some Windows components may not function. We recommend that you use “Prefer IPv4 over IPv6” in prefix policies instead of disabling IPV6.