How Do Extreme Primal Weapons Affect Gearing?

[Rasabox]

I plan to buy the Zeniths for any classes that I consider my "main" because I believe we will need to have the Zenith to "+2" the weapon or whatever they plan on calling it. The Primals are great for alts and like others have already said they allow faster gearing, but I am hoping there is a master plan here.