One problem to moving to IPv6 is that most of the firewalls I've looked at either don't support it at all or the support is very weak. I know that IPFire doesn't support it and I couldn't find any information on Smoothwall IPv6 support. I think that pfSense supports it but I don't know how well.

Come on people, it's 2018 and your building a network application. I'm thinking a top priority would be IPv6 capabilities. Apparently, I'm wrong.