We have a small office with maybe 10-20 devices connected to our local network (LAN). We are running an internal DNS for resolving local network domains. The DNS has been configured with only IPv4 addresses, because it was easier to set up like this, and there seems to be no reason to use IPv6 addresses for our local network devices. None of the devices needs to be reached from outside (WAN).
Am I overlooking any good reason to use IPv6 within the local network?
Note that this question seems to be a duplicate of Why would you use IPv6 internally? only at the first glance. My question is about using IPv4 internally, while the other question discusses NAT etc. which doesn't apply here.