Such a blanket statement is in fact true, but not correct.
But that is not what JCrook was responding to. He was responding to your statement that anything less than 3/3 in LotL was useless and broken.
At 0 perks, you can harvest 2 crops from every seed you plant. You get food, but won't be able to sustain a farm without finding more seeds to replace any that are lost during the harvest.
At perk 1, you get 4 crops from every seed you plant. As long as you have a large initial farm size (say 10 of the same crop), you are more likely to come out ahead when harvesting to keep the farm going. If you plant 1 seed, you can be unlucky the first harvest and not able to recover.
At perk 2, you are much more likely to succeed than fail when creating a farm (however, same issue as perk 1 if you start with only 1 seed and have bad luck at the beginning - no seed back and no bonus crop)
At perk 3, there are no worries about creating a self-sufficient farm.
When I play, I always work towards to getting a farm setup. The only difference I have made is now I wait until I get a single perk in LotL before I harvest from plants. Though I prefer to get the second rank in LotL if I can.
If I remember correctly, you also get more food per harvest now from plants that you harvested (compared to A19 where it didn't matter if you harvested a wild plant or one you planted).