It’s not just Mark’s journey that is depressing. I know he’ll get back up. I don’t need to read the comic to know that. He has Main Character Immunity. Everybody else that suffers and dies along the way are all just meat for the grinder and the show hasn’t brought anything to the table this season for me to find that entertaining or impactful.
Sure it’s necessary. It gives her range. Maybe all the top level soldiers can do it with their hands or maybe they all can period… but she has the ability to do it with range. It shows that there exists metal that can cut them rather easily… at least in their hands.