It’s not only the US which has to balance rural vs urban electorates. Some are even further down the spectrum like Japan where rural areas have even larger influence than cities compared to other democracies.
But in a way it makes sense. Without people in the countryside the people in the cities would have little to eat. Most countries go to some lengths to ensure some modicum of food security/self-sufficiency.
This argument would be accurate if we lived in a mercantile oriented world still, but there are plenty of countries that are entirely on other countries for basic necessities. While I can sympathize with the fact that farmers have gotten the rough end of the stick from seed corporations (like Monsanto) lately and that they have been forced into incredibly thin profit margins their work isn't inherently more valuable because it results in edible objects.
There are plenty of countries out there with a net import of food like the UAE, Germany, Russian, Japan, Egypt and Venezuela - that's a pretty diverse group of varying GDP per capita and political stability so I think it's pretty safe to dismiss any concerns of a strategic food reserve.