> It's also a privacy feature which ensures I am able to hide the number of unique devices in my network.

A combination of: (a) my Asus AC-68U not allowing non-reply, inbound connections for IPv6, and (b) my clients using rotating, randomly generated addresses, accomplishes the exact same thing.

NAT doesn't add much over a decent stateful firewall with a default-deny rule on incoming connections.

hide might be generous as fingerprinting devices based on their characteristics is pretty well understood nowadays.