If you have a shitty ISP that rotates prefixes like it's 2005, hosting anything public is a massive pain already. DDNS works just as well on IPv6, though.
Internally, a ULA will keep things reachable even if you move ISPs. You could even set up a NAT66 setup to translate your changing prefix to your stable ULA so you don't need to update any firewall rules, but that's a pretty terrible workaround for a problem that shouldn't be on you to fix in the first place.
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If you have a shitty ISP that rotates prefixes like it's 2005, hosting anything public is a massive pain already. DDNS works just as well on IPv6, though.
Internally, a ULA will keep things reachable even if you move ISPs. You could even set up a NAT66 setup to translate your changing prefix to your stable ULA so you don't need to update any firewall rules, but that's a pretty terrible workaround for a problem that shouldn't be on you to fix in the first place.