The IPv4 10.0.0.0/8 (along with the other private ranges) runs into lots of problems when connecting two private networks (e.g. VPNs, VMs/docker, hotspotting), whereas that /64 will not conflict with anyone.
The vast majority of people are not VPNing into networks they don't know and accidentally having arcane IPv4 collisions. This is not a real problem that needs to be solved.
I hadn’t really thought about that. That’s an actual, real (though still fairly minor) benefit.
Yes, I can’t even use many 10.x subnets at home because my work VPN configures a huge routing table including many of them.
Basically I had no choice but to redo my home network if I wanted to use my new work laptop at home (and I work 100% remote).