Magazines for those aren't really a reason to put points into them. Farming is only 20 magazines to max and you find them very quickly without points. And although cooking is 100 IIRC, you find them constantly even without putting points in. If you are limiting yourself to steak and potatoes, you don't even need a lot of them. But the gathering is useful on its own. Cooking time is okay, but is you start cooking before leaving to do something, the time doesn't matter.
If you stay at the base in multiplayer, it could be worth it. But if you are out fighting, I think it is more useful to focus on fighting perks in the early game before worrying about those.