[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.