Well, lets run the numbers. One corn and one pumpkin together with an egg, one animal fat and a glass of water gets you one punpkin pie rated at 50 food.
Two eggs would otherwise be best used in Bacon&Eggs rated at 36. It now depends very much on whether you consider one egg a rare resource or equal to the 5 meat or even something you can always get in quantities if you just drive around while hunting for animals or exploring anyway. Lets take the middle ground and rate them at 13 food a piece, and the 5 meat at 10 food as they are worth 10 as grilled meat. Animal fat is mainly used as cooking ingredient and should be in supply if you are hunting anyway. Glass of water is also not really worth mentioning.
So with that I would value 1 corn+1 pumpkin as 50 - 2x13 = 24 and you surely will agree that each is worth the same, so 12 food. One seed is on average say 3.75 produce, which means each seed is worth 45 food streched over its farm lifetime. While the typical can is worth 10 or 15 if you eat it.
Even if I just follow your initial argument to count it only as 2 produce and give some food value to animal fat it still comes out better than the best can even though the difference may be smaller (and I didn't even make the calculation with a top recipe like spaghetti which might look even better). But I can't see the reasoning for your initial assessment that seeds are only worth 2, you may have to explain that again. I would drop the "return to base" line at least, if you don't regularily return to your base anyway it isn't a base after all.
If you ask me, taking a corn seed home with LotL0 is totally worth it.
Food in general is weird.
You've got low-tier food and top-tier food and no real mid-tier stuff.
Like, I wanted to graduate from eating plain boiled meat because I had to eat like a full stack of it at once to fill up, so i looked into cooking and farming.
Beacon&Eggs is good, but there's no reliable way to get eggs.
Ok, so what do I need for the other foods?
Potatoes, corn, mushrooms.
Everything seems to require at mimimum two of these three, which means that you need a full farm and a bunch of seeds of each type.
Once you have all of those, you should be making stew anyway, so what's the point?
Like, Steak and Potatoes doesn't actually take meat and potatoes (a meat and one vegetable meal) it takes mushrooms too.
It also provides just as much food (50) as the meat stew.
So what's the point?
I'd rather if that meal literally just took meat and potatoes, and gave you 20 or 30 food instead.
A meal that gives you a decent but not amazing amount of food so you don't need to cook ten stacks of them, but actually doesn't require a full selection of every vegetable in the game.
Something to tide you over in the first one or two weeks while you're trying to get your initial farm set up and scrounge together enough seed-crops to actually get your corn, potato and mushroom farms going.
Cos that's the worst part. Having enough corn to start making 'proper' food, but not having enough potatoes, or enough mushrooms, so you're stuck eating boiled meat and the occasional bacon when you can find the eggs.
Nah, give me a real steak and potato recipe. Give me a steak sandwich (meat + cornbread) recipe.
Make them not great, but make them better than just boiling or grilling meat on it's own.
One vegetable is better than none.
As for the food that you make out of canned stuff... it's super situational, given the weird resources that they all take, and that there's no reliable source of specific types of canned food, so it's not really something that you can feed a whole group on. Plus, not every can is used in a recipe.
Setting up base in a building with a functioning vending machine is a pretty nice way to get a solid supply of food though.