After reading all these "zomg what will we do for 90 cap" posts, as a pure int spear, I need that new cold mana shield and the new cold phys defence buffs, but also need fire and light for the nukes. But then today as I was grinding, I only used nukes, shout, and more nukes, so how is a pure int spear and or s/s without weapon skills? I am seriously considering dropping hesukal so I can have 3 force trees, what do you all think about it?
And for leaving 30 in a skill tree, does it really help that much? Lvl 30 buffs probably arent going to help a lvl 90 in job war
Correct me if im wrong, and please, active weapon-tree-less nukers tell me what it is like

The reason you level your weapon mastery is make your nukes stronger. The higher the spear mastery the higher your nuke will hit when you use your spear. If you do not have a weapon mastery then you will not hit near as hard.