I fully support having huge stockpiles in addition to subsidies. There's a lot of things midway on the scale between "business as usual" and "meteor strike" where minimizing supply chain disruptions would likely prove to be of great benefit.
I completely agree that the current way things are being handled appears to have its share of problems and could stand to be better optimized. But that doesn't mean it's useless either.
Subsidies as a concept includes spending 1% as much on subsidies. Subsidies as they exist now however are a specific system that’s incredibly wasteful.
Producing dramatically less food and ending obesity are linked. If the average American eats 20% less obesity would still be an issue, but that’s a vast amount of farmland we just don’t need.
The current system isn’t designed to accommodate increased agricultural production, lowering food demands, or due to decreasing fertility the slow decline in global population. Instead the goal is almost completely to get votes from farmers.