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I agree with this but I would say the prefix is the only thing you should focus on.
It’s important that ISPs don’t regularly rotate your PD and it’s part of the rfc recommendations that they don’t. And the remainder of the prefix is your vlan space that is as important for VLAN routing as always.
This seems counter to Concept 6 in the OP.
for residential internet, the globally routable prefix can change
Do you mean that ISPs don’t regularly rotate your PD in practice? I’d actually prefer that they did to maintain a semblance of privacy.
Your prefix can change yes but the recommendation is that it shouldn’t in practice. You’ll find ISPs doing it right will extend your PD lease infinitely unless you release it for a long enough period of time. Similar to ipv4.
The privacy is similar to ipv4 also. All your traffic on ipv4 looks like it’s coming from your WAN IP… Your PD is in this sense equivalent (though not literally equivalent for all the pedants reading) to your WAN IP.
