Why does Precision get the best mana sustain, health sustain, damage and tenacity?
Half the roster can't make use of the base stats the tree provides. Attack speed is a wasted stat for most champs. Yet the PBE seems to give the tree 20% mana on a kill/assist like old morello. 5-30% Tenacity. And more runes that are outright better than their non-adc-tree counterparts. Barring 0 kills games of course. But when was the last time you saw one of those?