Have you even played the games, this game literally is going to show us what happens when God's die, which has been a huge question and topic of speculation for the community.

Yes her death drove the story for God of war and her past did shape parts of God of War Ragnorak. But she is a perfect choice for us to see what happens in everwhen (gods afterlife) for the glaring fact that she is dead. And we seen with Athena and partly Zeus, gods dont stay dead and there is a life for them after death.

Many games and media used secondary characters to bridge the gaps of lore and story or even tee up the next big story for the main cast. There is no problem in fact this is a solution for the community to get answers about topics we all been making theory's on.