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My phone gets a new IP when I hop from wifi to cell but it's still able to communicate. Supposedly rayfish has this solved too although I cannot test that since the computer is on my network but maybe I could tether something to my cellphone and test that way.
If you're using ipv6 supposedly you don't need to forward ports. So that means that regardless of what IP your ISP gives you, your network should survive.
You don't need to forward ports but you still need to maintain network rules for each port so you can get through the firewall. And those rules need to know IPs. And if your public IPv6 prefix changes you need to update the rules.
So, really, there's no advantage over forwarding, on the contrary, since forwarding uses private IPs which you can make static so they never change.
Some router software like OpenWRT attempts to work around this issue by using a special "minus netmask" shorthand syntax for the network rules, for example
::2/-64means you want to reach[whatever the dynamic prefix is right now]::2. Which assumes you've set things up so that a certain machine always gets static suffix::2, which means that machine does not do MAC anonymization and can use DHCPv6, which excludes all Android and iOS devices. So it can be used with Linux servers for example but with a lot of caveats.