You can build that way if you like. However with the loss of softcaps in 1.6, focusing on one pool is much more effective.
You *can* hybrid, but it's much more effective to focus one area for your damage and the other for utility.
your weapons damage will be based on certain things like (spell power/weapon power/max stamina/max magicka)
so you do lose out when you split these stats, BUT it will be viable once people get higher the champion tree (I have already tested duel wield/destro build) but I cant really find it viable until i get more points ^_^
a ton of builds will open up down the line (the OG magicka melee NB will work once you get more champ points also)