I know what your thinking, Big deal, I got logs in pfSense,
But here the issue is, most often you will be running your AP in bridge mode and having pfSense hand out the DHCP addresses, and if your in bridge mode not much info on whats connecting to the NAS internally behind the firewall is ever seen on the firewall logs. This gives you a level of visibility not normally seen within pfSense unless it is configured. Again if you can do it with one AP you can do it with an alias for many APs on a bigger network. This gives you more information into possibile mac spoofing and unauthorized access. If you use remote access and Dynamic DNS for your network, you can see the firewall logs and the AP logs as well.