[tialaramex]

> I'm not sure what the argument is here?

That std::hive will fit right in. Another container type you probably shouldn't use, draining precious maintenance resource from groups who have better things they could be doing.

> These are in the standard library because someone proposed their inclusion.

As with std::hive. Indeed the "unordered" containers, just like std::hive were repeatedly knocked back and eventually got in decades after they were obsolete. Persistence really does pay off in C++

> They're fine for the majority of people who really don't want to roll their own data structures each time.

Sure, doubtless std::hive is fine for that same majority of people.