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> Some ISPs are reportedly giving out a /128, and SLAAC works adequately with a router performing IPv6 NAT, so those ISPs don't see a problem.

Wow, that’s diabolical. Presumably these routers are some custom CPEs then? I don’t even know whether regular home routers support NAT66.

> I've never seen a mobile phone AP offer IPv6 to clients

I’ve only even seen it work without NAT when there was any v6! Usually the phone gets a /64, and there is a bit of trickery involved to make that shareable to other devices (NDP rewriting), but it works pretty well.

> I've never seen a mobile phone AP offer IPv6 to clients, but if they do they have to use SLAAC-compatible IPv6 NAT in that situation.

iPhone does that, and I’m pretty sure I’ve seen Android doing the same. The phone keeps a single /128 from the /64 assigned by the mobile network on its mobile interface and the re-assigns the /64 on the WiFi interface. No NAT is involved.

Well, my phone as access point grants an IPv6 public IP without NAT. There's a stateful firewall somewhere in the chain though.

Thats why android supports dhcpv6-pd for a /64, but not assigning a /128 from dhcpv6