> SLAAC is more complex than IPv4 w/ NAT w/ DHCPv4? Serious?

Yes? Has this ever been in question?

Stateful DHCP provides a _reliable_ way to configure clients, while SLAAC is anything but. It's also insufficient in itself if you want to configure things like NTP servers.

But that's not the main issue. The main issue is that with SLAAC you are supposed to hand out real routable addresses. That are _not_ controlled by you, so the end devices need to be able to handle prefix withdrawals and deprecations. This can lead to your printer not working if your ISP connection goes down and it has no more active IPv6 prefixes.

So you also need a stable ULA. But even that is not a guarantee because source IP selection rules are, shall we say, not the best.

But wait, there's more! You can trivially load-balance/failover NAT-ed IPv4 network over two WAN connections. Now try to do that with IPv6. Go on. I'll wait.