We banned the Advanced Template at our table. It's just too potent. Especially combined with Young.
We also play a lot of monster characters so the Ability Score Construct Mod and Advanced Template became wholly inappropriate unless repriced appropriately using Race Points and stat books respectively.
Wouldn't adding a weapon to an Animated Object that the object then wields require an appropriately sized weapon?
An Animated Object longsword works out to what; a tiny to small size creature? Adding a weapon to it means it would be wielding a fine to diminutive weapon?
Even if the weapon gets to 'wield itself' you're still paying for it twice. Once as per the cost of making an animated object and again as per the cost of making a weapon modification.