For me when it comes to naming in cases of non-self inserts, it makes it easier for the main character to stand out in cases where a VN may use an ambiguous or similar name to other characters where early on it can make it harder to follow wen there are many characters on screen at the same time. Beyond that, this is a uncommon issue to encounter since it often requires a lot of dialogue intensive content with multiple characters early on, thus not giving enough time for the user to identify with the naming of the main character.