So it's like instead of having 3 talent trees with different categories and only being able to max one; it's having six and you get to max all of them?
Say you take the Mage archetype you can chose three classes: Elementalist, Warlock, Pyromancer, Stormcaller, Archon and Necromancer
Say I want to be mostly a necromancer, but have SOME buffs and a few extra Damage over Time spells, Well I would put most of my points into Necromancy, a couple handfuls into Warlock for the DoTs, and a few into Archon for buffs.