Thor - Female Thor motivational poster

I always hate it when there's female equivalents to male superheroes, it's like they're copy+pasting the male superheroes because they can't be bothered planning a detailed female superhero. Was there anything wrong with taking a Norse goddess, like Freyja, who was a Norse goddess of battle, and giving her another legendary weapon of Norse mythology, like Gungnir or Gambanteinn? Just having a copy+paste of another superhero, just with a different gender is both lazy and sexist =/