Sure, it adds a little bit of “security” like the camouflage on tank example, or the prey jumping. Those examples are poor however, because — unlike changing default ports, adding knocking, obfuscating code - these examples are extremely low maintenance/cheap, and come with essentially no downside.

What’s missing here is the discussion of tradeoffs. I fail to see how e.g., requiring port knocking adds enough security to justify the annoyance. Changing the default port, maybe, but given how easily it’s detected anyway, the cons still outweigh the pros IMO.