Pay no mind to those that complain about the manga. It's not as if they are invested in some way, nor are you beholden to them. Nobody is forcing them to read. Nobody is forcing you to translate either. Don't be pressured either way.
Between translation and aesthetics, I'll choose translation. Yes, it can be improved on, but the translation itself should be your priority. Thank you for picking up the series.
Stories often do stuff like this to justify the power creep of the MC later. This is also common in fanfiction, especially self-inserts back in the earlier days of anime fandom. As long as the author gives his character a tragic backstory, it will be the license to get all the girls / all the...
I only hope this series doesn't get too bogged down by her conscience later, like "omg I made war even more cruel and effective in this era and killed more people and brought more misery".