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It defends against the lowest level of automation. And if that is a legit threat in your model, you are going to have a bad time.
It’s just going to trip you up at some pointI’m not saying it should be your only defense. I’m saying that changing defaults is a good idea for secure systems.
For instance, you should change the default WiFi password on your router.
Yes, because a password is security
So is changing the port. It won’t do a lot in terms of security but it will help a tiny bit