Multiple addresses per host are a real-world feature of IPv4 and have always been a design goal of IPv6.
We've already defined the default address selection algorithm (RFC 3484).
Applications are welcome to use a different algorithm, but they
don't need to, which is why the default was defined.
it's one thing to allow multiple addresses per host in the architecture, quite another to expect hosts and apps to be able to tolerate different addresses with different scopes and force them to choose between these addresses in order to interoperate.
the default address selection algorithm will only work in a fairly narrow set of cases.
it's simply not the case that applications "don't need to" use a different algorithm.
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