Consider this: every magical item you pick up is charmed. Item bonuses come from somewhere.

Increased Offense and Defense is the result of light weight material or well oiled parts.

Increased Damage, Armour and Durability is due to excellent workmanship.

Magical Damages and Skill bonuses are powerful enchantments.

Increased Resistances and Attributes are the result of magical charms.

Charm Slots are increased Resistances and Attributes that haven't been applied yet.

Everything can make sense in real-world terms if you think about it.