Some perspective: Japan has lots of disasters, so it’s required for you to have 72 hours of emergency supplies. This helps the responders to make sure their supplies go to the unfortunate of the unfortunate.

For the rest, yeah, I don’t disagree. 72 hours of food and water will not help in a draught that lasts for months (maybe 30x longer than the stockpile) or climate change that lasts for maybe 30x longer than 3 years