You might as well be saying that electrical installation is trivial, as it's just a plug you need to plug into the wall. All the stuff that I've been talking a

You might as well be saying that electrical installation is trivial, as it's just a plug you need to plug into the wall. All the stuff that I've been talking about is what is required so that in the end, you can just plug in your laptop and have IPv6 connectivity without any manual intervention on your part. Yeah, that's how it is supposed to be. But that depends, among other things, on the ISP providing a reasonably sized prefix. Also, there is more to networks than "the router" and "clients". You can have more than one router, you can have servers, you can have routers with multiple interfaces that are isolated from one another ... not everything is "my home DSL router with built-in WiFi access point, used by one smartphone, one tablet, and one laptop". And I think you might be confusing SLAAC with DHCP? Those are two completely distinct mechanisms, and you don't need DHCP in IPv6 networks at all, in particular not for client systems.