Godwinson
"Well, I've got nothing."
There's a reason right in the update.We already have tons of storehouses, I see no need to make the Palace into a storehouse when we already have an excellent distributed storehouse system (far better than any of our neighbors).
Fifth were storehouses. The king's residence was already close to a number of central storehouses and granaries so it made sense, and there would of course be internal stores for the palace's consumption, but these proposals were for major areas to do nothing but store critical goods and administer their collection and distribution. These would certainly help with administration purposes, and help the city if it were ever cut off from food supplies by disaster or war.