If you really think someone is wrong don’t ask them “why, why, why” incessantly like a toddler, grow a pair of balls and just speak your mind.

And in this case I meant “your IP” as in, the grand scheme of things “an IP address that you own”, a VPS for instance, not necessarily the destination. Obviously you wouldn’t need to tell a firewall what its own public IP is. Though if you want to be a pedant, you can absolutely use DDNS with an outgoing rule, to limit traffic to the outside. Is that wrong? Have I clarified my thought to your standards?