Personification of the parser is a stylistic choice. Sometimes it can be a character (see VIOLET), or it may just be a dry report of the player’s actions. Some people do not enjoy default parser snark “You jump on the spot, fruitlessly.” and will alter the messages accordingly.
It’s possible to rewrite all the library messages to avoid the 2nd person “you” - again as a stylistic choice, such as changing “You open the red door.” to something like “The red door is now open.” I think there’s an extension called “Neutral Library Messages” that did this, but now I7 makes it easier through the index to change default responses.