It's so funny that I don't want to judge anyone's life / thinking decision but this Sayuri is the character who love criticizing others the most.
All the tragic outcomes were due to her arrogance and ignorance. Utilitarianism is indeed a method to lead someone to success (which depends on how that person define "success") but this only works for that person his / herself. You can't force someone to follow your path / mindset. People is willing to change only when they want to change, not by external force.
Being utilitarian may be a method / skill for Sayuri to survive, but this can easily gaining enemies. Then she needs a way to survive. More like a vicious cycle.
Sayuri and Eren are completely opposite in their characters, yet they know each other (including their characteristic problems) I am looking forward seeing how they live together in the USA. (There are hints showcasing in the ED)
