So this 'feature' is just a fix for the issue with tracking that would not be there with ipv4 beside that my internal ip's are changing every day to bring more confusion into my internal net. nice!
Yes, yes, we have privacy extensions, but you can still group those through higher-level fingerprinting. You don't get mixed traffic.
You can set it up so your devices can have two IPv6 addresses. The shifting address for external traffic, and a static one for local traffic. I think this is the default in many linux distros now.