No, my connections time out for a brief period of seconds or minutes and then everything is fine for the next two years (until my ISP cycles my IP out again) and I don't actually need to do anything to resolve this. I wouldn't even know when my IPv4 address changed because the impact is so minor. uPnP may be on by default but that doesn't mean most people are actually using it for anything.

And what do you think when ipv6 changes addresses? Notably, even less.

When my IPv6 changes my prefix changes and then my internal devices have new IP addresses and I don't know what those IPs are.

That is what link local addresses are for - which you can access your devices on just fine, and don't change. And bonus points - aren't externally routable either.

They are also much shorter. [https://en.wikipedia.org/wiki/Link-local_address]

One really nice thing about IPv6 is you can (and do) have many addresses, all of which work.

for example, you can add a manual fe80::5 address to one machine, and fe80::9 on another - and use those to access those machines on the local network. And not have to worry about that being externally addressable, or having conflicts, etc.

And they won't change when your external addresses change either (unless there is some weird software bug in your OS or something).

Though you probably want to use a unique local address range instead [https://en.wikipedia.org/wiki/Unique_local_address] as they're more equivalent to the 10.0.0.0/16 type behavior you're expecting.