The problem here is, that also larger networks (eg. student wifi at some university) uses a /64 for maybe even hundreds of students connected at the same time.

The problem here is, that also larger networks (eg. student wifi at some university) uses a /64 for maybe even hundreds of students connected at the same time. Hold a lecture, tell the students to go to github to download some tool, and the first 10 will succeed, and the rest will get rate limited. The same is true now with NAT (where they're all behind a single ip or a very small pool of IPs), but IPv6 should make these things better.