Production in Jorradith is at 99%, with a full population the region produces a surplus of 6 bushels per day after the production nerfs; with 363 bushels in the granary because I haven't had a chance to go back there in a while, 4 bushels rot. Weather in the North Shore region is "average" right now.
Also, what is the period of the rot? How often does food rot? Every day, every few days? I'd thought it was every day but I didn't get a rot report on my daily region report today.
Re enabling rotting proves to increase the micromanagement of the food, now I have to worry about not stockpiling too much food in one region and this means I have transfer food back to regions and post small buy orders when I need food.
If there are 2000 bushels of food in your city, 20 of those will rot; if you have 200 bushels of food across 10 regions, 2 bushels in each region will rot, or 20 bushels. The only difference is whether or not you bought the food that is presently rotting elsewhere or not, which you're right, will increase micromanagement if you are trying to get the most bang for your buck.
It will also increase micromanagement if you want to maximize your profits. As you store more food, your effective production drops and so food stores need to be kept low as you send out small amounts for sale more frequently in order to make the most money you can. Stored food in rurals now also caps out at (depending on the rot period; I thought it was daily but didn't get a rot report on my daily region report today), for Jorradith, between 500 and 600 depending on the weather and assuming food rots daily.
Added potential to micromanage seems kind of nice, as long as it doesn't end up being required and the difference doesn't end up being that large.