There was a third reason that Yoshida was nervous to see how people would react to the game: Horizon's protagonist is a young woman.

"She's a female lead character," he said. "That has always been the vision by the team, but we had a discussion. Is it risky to do a female character?"
- via Polygon

I know that female leads are not the norm in video games, and I’m glad that Guerrilla Games and Sony stuck to their guns and kept the lead character a woman. The game looks badass and so does that main character; bring it on!