[Sanzig]

Well, allocating anything smaller than a /64 to a customer breaks SLAAC, so even a really small provider wouldn't do that as it would completely bork their customers' networks. Yes, DHCPv6 technically exists as an alternative to SLAAC, but some operating systems (most notably Android) don't support it it all.

[tsimionescu]

There are plenty of ISPs that assign /64s and even smaller subnet to their customers. There are even ISPs that assign a single /128, IPv4 style.

[patmorgan23]

We should not bend over backwards for people not following the standard.

Build tools that follow the standard/best practices by default, maybe build in an exception list/mechanism.

IPv6 space is plentiful and easy to obtain, people who are allocating it incorrectly should feel the pain of that decision.

[cereal_cable]

I can't imagine why any ISP would do such absurd things when in my experience you're given sufficient resources on your first allocation. My small ISP received a /36 of IPv6 space, I couldn't imagine giving less than a /64 to a customer.