There is, in fact, a non-intellect potion in legion which consists of approximately 5-10% of total damage done. There are also trinkets with procs which, depending on the trinket, can consist of 4-10% damage done. There is also a neck enchant ( http://www.wowhead.com/spell=190894/...e-hidden-satyr ) which does actual damage, not haste and crit buff.
I wish people like you got their facts straight before spewing bullshit and also learnt to play their class. How are u still saying 74% is correct?
Like the poster above said, using the best talent build, lightning bolt (and mastery procs) + lightning rod are approximately 30% of total damage done. Lava burst is approximately 15%. Not to mention the buffs still do not adress the biggest issue elemental has got - dps during movement.