I also haven't found it compelling to implement IPv6 on my small network. If I use v6 addressing for my own nodes, what do I gain? I don't need my internal network to be routeable. And even if I could come up with some use, relying on those addresses being routeable creates a single point of failure at the tunnel gateway.

Alternatively, I could setup a v6 tunnel for my home network and each of my remote nodes that doesn't have native v6, "beyondcorp" style. But I want to have an "internal" network where everything is definitely running over wireguard. But wireguard over v6 just means more bytes on the wire and suboptimal routing, and v6 over wireguard falls under the first point.

Now it's true that if one of my VPS's was v6 only, then I'd start to care about v6 reachability to keep my wireguard mesh a full mesh. But at this time I just don't see the use, and without a use anything I setup for kicks will eventually fall apart like my previous few tests of IPv6 did.