I think it is more about looking for a way to make the early game challenging. That is, it makes for an interesting game even if it doesn't model the real world. If so, I can admire the goal, but think it is better to come at it from a different angle than believing all remaining can food is dented and compromised - as if previous scavengers were that picky.
IMO, less-than-perfect food preparation under difficult situations is more believable and just as viable to implement.
I would also note the game hasn't defined just how long ago the apocalypse was and the evidence available to us in-game presents a contradiction. Some things in the game suggest the apocalypse was very recent. So, in a way, that supports an approach of "go with what's gamey and not what makes sense." I just happen to like it when we get both.