A silent protagonist can be highly effective because it allows players to project themselves onto the character, fostering a deeper sense of immersion and personal connection with the game world. By not giving the protagonist a distinct voice or personality, players can imagine the character's thoughts and emotions as their own, enhancing the role-playing experience. This approach also maintains focus on the game's environment, story, and supporting characters, creating a unique narrative where the player’s imagination fills in the gaps, making the experience more personalized and engaging.
That said, it's not for everyone.