Many if not most people do not have native IPv4 (no CG-NAT etc.) access and therefore simply cannot host games locally. This problem will only get worse over time as IPv4 exhaustion aggravates.

For me, not being able to just host a game to play with friends is degrading the fun potential of this game massively.

Introducing IPv6 support fixes this issue completely as it is readily available from ISPs. This would allow many more players to host locally.