GameSpot has published a wide ranging interview with Metroid Dread producer Yoshio Sakamoto. One of the questions in the interview put forward to Mr. Sakamoto was why is Samus a mostly silent protagonist in the Metroid Dread as a growing number of games have started voicing lead characters, but in Metroid Dread, Samus Aran barely speaks. Mr. Sakamoto explained that the team wanted to create a dark, dismal, and dreaded atmosphere, and preferred using the visuals and cutscenes to play the part rather than relying on voice acting. He concluded by saying that the team wanted to make the player to think, “What is going on? What is Samus feeling right now?”
Why go back to having Samus as a mostly silent protagonist? She doesn’t have her Metroid Fusion elevator thoughts or Other M monologues anymore.
In this game, Samus barely speaks. The reason that I wanted to make it that way is the main theme of this game, which is dread. I felt that to convey the current situation of Samus or what Samus is thinking right now, this would be better conveyed to the player not through actual words or actual voice, but more with acting or visuals. I want the player to think, “What is going on? What is Samus feeling right now?” That is why I decided to go this way for this game.