Did you manage to get IPv6 prefix delegation working with dynamic prefixes? Best solution I found involves scripting to re-build config files and restart a daemon, where OpenWRT just does it out of the box.
I disabled IPv6 as my little ISP has not yet figured out how they want to bill for or assign/segment it out for static assignment. I have multiple static IPv4 addresses. I only use static IP's but that is a requirement specific to me. The firewall is very simple and just forwards packets and uses a simple IPv4 SNAT. The only time I've had it set up more complicated was when a guest was abusing P2P so I had to block it using string matches on the unencrypted commands.
My setup is honestly simple enough that a write-up would not benefit many. My Unbound setup to block many malicious sites is also fairly well documented by others. The null routing of commonly used DoH servers is straight forward. My Chrony setup would just annoy people as I only use stratum-1 servers and the options would just look like cargo-culting to some.
About the only thing not commonly discussed is the combination of thc_cake and some sysctl options to keep buffer bloat low but OpenWRT has their own take on that topic already.
Outside of Tokyo you can still easily get one of the other regional IC cards [1]. They can now all be used everywhere in Japan including the Tokyo subway, provided you don't start travel in one region and end it in another.
That's fine and all (I make heavy use of this — always miss it on Windows), but it's a workaround to a legitimately inferior UX decision.
It's similar to when early Dell XPS's would overheat when gaming with the monitor open, because the monitor itself would block the sole exhaust vent. The workaround then was to attach an external monitor and keep the laptop screen at 45 degrees.
At my electronics engineering school we had access to everything we needed to mass-produce those decoders and did so at a reasonable scale to pay for our studies. That was a lifeline. Knowledge of TV signals gave me my first job, during which I got to work with the guy who designed the scrambling system and had a chance to thank him in person. Small world.
If I understood correctly, the link between ULA-based address and host name is done through a DUID. This is assuming that DUID values do not change over time and can easily be harvested from everything you want to connect to the local network. What guarantees that DUIDs are fixed and easily collectable? What are the solutions if they aren't?
Things in IPv6 land can have multiple IP addresses - you can have a fixed address or use a fixed link-local address for an entry DNS if you're not using something like multicast DNS, but it can still initiate connections using a privacy extension address.
Even now I doubt many home users have a local dns server for reaching their printer by name. I think Windows uses NetBIOS for this purpose, which should work fine over IPv6 too.
Some models of home routers do run an internal DNS server which makes things accessible under a subdomain with whatever name you've set for that device in the router's configuration.
