Oh I'm really sorry, won't happen again! And thank you again for replying to my question!Indeed, if the instructions for your embassy don’t ask for something to be authenticated it’s because it’s not necessary. To say it the obvious way, they ask for what they need.
By the way, I was making a very specific recommendation about a very specific instance, it’s generally not a good idea on the forum to jump on something like that and try generalize it.