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As I understand it, NAT is a firewall with only a very basic configuration: allow all outbound and accept only established inbound. If you don't expect to have any incoming connections and completely trust all your internal devices then its good enough.
However, if you start wanting to port forward for servers (SSH, FTP, video games) you need to poke holes in the NAT firewall and it has no additional configuration options to help you. The same goes for if you have internal (ex. IoT) devices that you don't necessarily trust, there are no rules to block outbound traffic.
NAT is not a firewall. NAT does not inspect packet payloads, it doesn't do anything except attempt to route packets to where they are supposed to go. If the connection originates from outside or it is a 'connectionless' protocol, the NAT has no idea which internal IP to route to, so it drops the packet.
NAT provides some security by sheer coincidence and not by design.