> Realistically though there's enough fingerprinting in browsers to track you regardless of your public IP and whether it's shared between every device in the house or if you dole out a routable ipv4 to every device.

Yes, browser fingerprinting is a big issue, but it can be mitigated. The first thing everyone should do is to use a network-wide DNS blacklist against all known trackers (e.g. https://github.com/hagezi/dns-blocklists) and run uBlock Origin in the browser.

You can go further and restrict third party scripts in uBlock, or even all scripts. This will break at lot of websites, but it is a surefire way to prevent fingerprinting.

Then of course there is Tor.