Many threads on here about there having to be an option allowing you to unequip weapons for those who only want to play the PvE with 1 primary for immersion but I've found another reason for this - PvP!
Just been playing PvP for the 1st time and with this system of PvE progress carrying across, if you decide to never equip a 2nd primary in PvE you only play with 1 primary in PvP and are therefore handicapped against all others. If you choose to balance up and equip a 2nd primary for PvP, you cannot unequip it for PvE.
Yes you could create a 2nd profile just for PvP but why should you need to? Why is this simple option not already in game? Aside the fact that having 2 primaries in PvP is stupid anyways this option has to be implemented.