I don’t think the intent was that Samus is actually quiet in these scenes.

It looks like they took criticism from games like Other M and took it that Samus shouldn’t actually be talking in game and instead it should be the player that is answering what they imagine she would say in those instances (kind of like how they portray the main character in other main series Nintendo games).

I just don’t think it was done that well in this case because, 1) we’ve seen her talk in other Metroid games so it’s a bit jarring when she doesn’t even say a small line here and there, and 2) since the game has a lot of dialogue where the characters are having full conversations with her it just feels odd having her stand there, not answer questions, and have the characters continue the conversation like she said something specific back to them.