The change from MAC address based stable IPv6 addresses is probably the most significant, as described in RFC7217, and becoming the recommended default for SLAAC in RFC8064.
If router vendors implement RFC7217, the concern about swapping a network interface module, and the router's IPv6 address changing, because the MAC address changes, goes away. I haven't had a chance to look, however somebody from Cisco told me a few years back that they'd implemented RFC7217 for the HSRP floating link-local address. https://www.si6networks.com/ <https://www.si6networks.com/2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/> 2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/ <https://www.si6networks.com/2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/>
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