MRE's are self-sufficient packets (almost - you need water) that you can hand out to people who have no other supplies or tools or equipment or perhaps shelter after a disaster and they'll be able to feed themselves a hot meal. Like, if there's a dozen starving people, then throwing a MRE box and a water canister out of a truck (the original article includes a photo of such distribution -
https://archive.md/lu4zn/eafd5ec61f35e3afe34d6f7eab59c6ee12e...) and driving away to the next location is sufficient logistics, which is why it works for quick military resupply.
Dried beans and canned vegetables are great if you have a kitchen - you need a stove, you need a pot, you need a can opener, you need a bowl and a spoon/fork. MREs have everything included and will work even if you have a bunch of people who have run out of a burning house naked. It's a very niche advantage, of course, but a niche that may be relevant in disasters.
Also, if you do have a stove and vegetables and a dozen people, they have to stay together or return to get fed; but you can hand out MREs and each can go on their own separate ways immediately afterwards. Again, a specific niche for unusual circumstances, but both military and disasters can have events where this helps a lot.