Growing Amulet of Mighty Fists

Question

A GM recently pointed out to me the Growing magical weapon ability:

Once per day, a growing weapon is able to grow by one size category, dealing damage as appropriate for its new size and allowing its wielder to affect creatures one size larger than normal with combat maneuvers limited by size. The wielder is able to use the weapon normally without penalty despite its increased size. The weapon remains at its increased size for 10 minutes.

Does this apply to an Amulet of Mighty Fists, to allow a growth in unarmed strikes? (As you may be able to tell I'm on the hunt for ways to boost my monk's damage output.)

As far as I can tell, there is no reason, RAW, for this to not apply. The text doesn't call out specific weapon types that cannot have this applied to it (as does Keen disallowing non-slashing weapons), and it is a melee weapon magical ability.

Answer 1

Arguing FOR:

PF Monk, Unarmed Strike Ability

"A monk’s unarmed strike is treated as both a manufactured weapon and a natural weapon for the purpose of spells and effects that enhance or improve either manufactured weapons or natural weapons."

As [equivalent to] a natural weapon the Amulet's abilities could affect it.
As [equivalent to] a manufactured weapon Weapon Growth could affect it.

In Pathfinder, the Amulet of Mighty Fists can specifically be used to "project" melee weapon abilities onto a weapon, so combining it with the "Growing" ability would work quite well.

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question for thought (and a time and placed more suited to random debates): why were fists not simply declared "natural weapons", to eliminate so much of this dodging around?