Speaking from my former Banker character perspective.
Yes, many regions have been suffering starvation. We have traders yes, but without hardworking lords, even Bankers cannot force the lords to open the market. And the last I hear recently, there is a bug with our trading distance, for one of my character a Region Steward who is quite helpless to prevent starvation, he need go back to the capital city Marketplace just to sell food to other region. Received a too far distance and you-should-not-be-seeing-this-offer message.
It seems when we implement that new trading system, we are expecting lords to do most of the food trading tasks(manual) and we also expect the automatic set part(automatic). Problem is we did not realize many of us are lazy to lookup the daily market trading. So we have to rely on the automatic part of the new trading system.