Why limit Giants Blood in POE2

In POE 2 there is a skill on the passive tree called Giants blood that allows you to dual wield two handed Axes Swords and Maces. This is very cool, but I just ask, why limit it to this. Why not include Staves as well. All I want in this game is to be a battle wizard. I want to be Gandalf. Gandalf used a Sword and a staff at the same time... This ability would solve what every game has failed to do. All I want is to be able to use a sword with a staff... it doesnt have to be this giants blood ability, but it makes sense to just add staves to it, it could be its own thing but I just hate how every single game to market has failed to give me the power fantasy I want of a long sword and Staff dual wielding character. I dont care if its the worst build in the game if I could use this weapon combo Id only play that combo for the next 25,000 hours im on this game. Please find a way to allow this dual wield weapon interaction.