That wouldn't help much. Heroes do overheal with passion, and that could use some adjustment, but there are aspects they can't grasp.
For example, prot spirit, life sheath, and similar spells can prevent hundreds, even thousands points of damage, saving dozens of energy points. But heros can't know who to prot and when, who to allow to die, who to save at all costs.
The only thing that could use a bit of adjustment, is AI being a bit more cautious with overhealing, but above all, better synchronized. AI will frequently double heal same person. Same with rezing.
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