Actually...? Yes.
Tanya was brutal, yes, not from up-close and in the trenches, but from a Commander and in the Air, there was that disconnect between her and everybody else.
This manga? Brutal UP CLOSE and PERSONAL, and from a kid's perspective of their first time seeing real combat and some of the worst things imaginable, and NOT being OP. Being a magician medic, and having so little, you can't hardly do anything before passing out. She's not given hardly any training, and no time to really do much of anything beyond "survive". There's no schooling they can get, no safety to avoid their shitty choices in life. They picked it, and now they're stuck with it, either until the end of the war, or they finally die.
Tanya= FUN magic Brutality
Nikki= Realistic magic Brutality
Tanya = not-so-relatable, watching a Narcissist fight a god.
Nikki= relatable and not fighting a god, but fighting to simply survive.