Well, narrators came from the text adventures and the graphic adventures of Sierra also included them, since they basically inherited many conventions of interactive fiction.
LucasArts on the contrary used the protagonists to describe to you what you see and what's happening.
Weirdly, narrators did disappear from Sierra adventures after Grabiel Knight 1. I think with King's Quest 7 characters started commenting on everything. I have no idea why this decision was made.
But anyway, if you let the characters comment on every action then you can form a closer bond between the player and the avatar. On the other hand, it seems then like the avatar talks constantly to himself, which may result in weird situations if other characters are around, especially in serious games.
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