Hi guys
I friend of mine recently had an idea for an elven mage capable of transforming himself into a gorilla. He suggested that such a mage could then leave agility, reaction and strength at 2/1/1 for the elven form. And during runs he would simply change shape to a gorilla (sustained by a sustaining foci for as long as he wants) in order to have good physical stats. And since the shapechange spell boosts the attributes of the animal the mage changes into, he would end up with a mage who has Body 9-10, Agility 7-8, Reaction 8-9 and Strength 8-9 plus his normal mental attributes as a Elf (Intuition 5, Charisma 8, Logic 5 and Willpower 5.
The advantages are imho obvious. And to further increase the effectiveness of this concept, the mage could buy some custom made gear (like gorilla size armor) to make him even thougher.

My question to you guys is:
Is he missing something important? Or is this concept really that effective and without any significant downside?