Right that's why the properly stored part is important. Guys not giving a fuck throwing them in and out of trucks and planes over and over again tends to have negative effects on packaging. And each item is individually sealed so even if one pouch pops the chances are decent the others survive
Sure, but if you're going to go through the trouble of a controlled climate storage facility, mylar bags, oxygen scavengers, and sundries othet things you can do to preserve food, MREs are not a good choice of things to carefully store.
MREs are
1) Very bulky. Anyone with any sense doesn't carry fully pouched MREs in his pack when he can toss out a bunch of cardboard, extra spoons, salt packets, and other nonsense and compact them down to easily a third their volume.
2) Not appropriate nutrition for sedentary people. Really you could probably get by on the calories from just one, as they're salty and packed with sugar. This is reasonable for people expected to be fighting, patrolling, or doing lots of manual labor, but it's pretty unhealthy for a preppie sitting around in his khakis and polos eating and peeking out the blinds forever.
3) They're bleeding expensive.
The whole "I'll make a multi year stockpile of food" idea doesn't make much sense, anyway. Perhaps if you plan to become a vault dweller, but even then it's smarter to come up with a way of replenishing your supplies without getting radiation poisoning. If you're prepping for an economic disaster, it's just plain silly. I guess if you plan to become a self-sufficient subsistence farmer, having a granary to store a year's or more worth of foodstuffs, as a buffer against drought or crop failure, could be worthwhile, but if you plan to live somewhere people know you exist, you're better off being able to trade for goods and defend what you have.
The true prepper focuses on good social skills, physical fitness and health, and having a wide scope of practical abilities and knowledge. Note that these will all serve you well no matter what happens, while having ten times as many assault rifles as you have hands and forty year's worth of carefully preserved nixtamalized maize flour will only make you either poor in status quo or robbed in a disaster.
None of this is to say anything against having a reasonable stockpile to get you through lean times, but what are going to do, hide in a bunker and eat canned peaches for the next fifty years? If the world is such a wasteland that you can't farm, forage, hunt, steal, or trade for what you need, why bother?