That's true, that's why I said that it "can be". And if you have a special edit command, like "systemctl edit", then it can take care of the details for you, wh

That's true, that's why I said that it "can be". And if you have a special edit command, like "systemctl edit", then it can take care of the details for you, which is I presume the reason for its existence (much like visudo).