Having global addresses instead of NAT means less control over your LAN
You can still have internal IP addresses and things like the router firewall work pretty much like they always have. I’m not sure what you mean by less control really.
these unique public addresses can track users more accurately
I feel like that concern is overblown. You get way more information from DNS, for way cheaper, than you get from “there were 27 devices, now there are 28!” and both takes being the ISP and observing the traffic.
It’s also not like VPNs can’t work in IPv6 land for people that really are conscious of hiding as much information about what they’re doing from their ISP as possible.