I see an MRE as a way to carry or store a completely self-contained hot meal, with no need for fire. For that I think it's useful. I have one case of twelve; I wouldn't suggest more than that for most people.
That's my plan as well. I keep 3 days' worth in the plastic tubs that comprise my bug out kits. I can load the kits in the car and have water, food, shelter and heat/light all together. For bug in situations (in my neck of the woods that usually means snow/ice storms) I keep a couple on hand just in case the pantry runs low of staples or to have a break from pasta and soup. I keep one in the cars just for that stuck in traffic forever occasion.
Advantages are no water or heat required (highly desirable, though) to prepare them. Wouldn't use them for extended camping or hiking trips.
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