I also haven't had any issues with UDP behind an IPv4 NAT, nor behind an IPv6 firewall. I'm just suggesting that at whatever rate people do have issues with UDP

I also haven't had any issues with UDP behind an IPv4 NAT, nor behind an IPv6 firewall. I'm just suggesting that at whatever rate people do have issues with UDP behind an IPv4 NAT, people would similarly have issues behind an IPv6 firewall.