Residential users just buy another router for wifi coverage at the local wall mart. They have no clue about anything internet.
That is why isp CPE devices should always perform dhcp-pd on their own to provide a prefix to the downstream devices so those have globally routed ipv6 too.
For that to work you need concepts like route aggregation in the form of a /48 for the CPE so it can hand out a /56 to the customer bought CPE.
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