The anonymity is for ease of use, for not having to register to contribute.
This being the default doesn't mean it's the only way you should post.
Avatarfagging is against the rules because it quickly fills up the image limit that has been set low for how resource intensive images are to process and move over the network.
You do realize that you're posting on a board with IDs and flags, right? The board itself assigns you a name and additional identity.