yeah, under IPv6 based home networking, you just assign a block of addresses to a home, 512 or something, for example, and then you just use a stateful firewall to do the same exact thing that a NAT + a stateful firewall would be doing on a traditional IPv4 network.

Nothing stops you from using a NAT if you felt like you wanted your networking to be more complicated for no reason. But you probably shouldn't.

There are potential benefits for the anonymization of traffic (though this is probably easy enough to defeat by simply sniffing for all traffic across the IP block) a denial of service wouldn't be super important anymore, as you could just engage in round robin across the other IPs, unless of course you DOS'd every IP all at once, but that would be super fucking obvious and trivial to deal with. Though it might kill an individual computer in the network due to traffic influx.

You could still engage in DHCP IP handouts, which would actually be beneficial in terms of traffic anonymization in this case. Especially on a high frequency basis. Similar to the effects of NATing on an IPv4 network.

Plus you could still grab a static IP address per device, and then just pass through firewall rules to allow external connections or whatever you please. No forwarding required.