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IMHO it means that they are not fully IPv6 compliant. Corporate networks often have DHCPv6 rather than just SLAAC.

They are fully compliant, SLAAC is part of the standard whereas DHCPv6 is an optional extra.

DHCPv6 also does not work without RA. DHCPv6 just assigns an address, a routable prefix, dns servers etc, it does not assign a subnet or any routes, you need route advertisements for that.

Seen like this, you can also argue that DHCP is an optional extra for IPv4, but it almost essential in most networks. Sure, IPv4 has no SLAAC that can be a valid alternative, but still, given that SLAAC doesn't solve every use case...

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