At this point, I don't have an opinion on the farming changes. I'll have to see how it actually plays to get a better idea of the trade off involved.
If you don't need to do something to the world terrain to prep it, I think that's a detriment - because now you can make a bunch of food plots in your inventory while on the run. With A17 and earlier you had to physically stand where you wanted the farm plot and spend a small amount of time watching an animation of the ground being worked.
Being forced to "build" a farm plot like you would a wall, gate, or bar, is a meaningful choice IMO. You have to spend time, standing still, which opens you to attack and restricts you from doing anything else (except inventory crafting.) There's more to the equation than "we took out the hoe, and replaced it with nitrate."
Again, I'll have to see it in action before making a decision.
-A