What one has to keep in mind as well, that even though tractors are really heavy they spread that weight across a large area (using low tire pressures and having massive tires to begin with). So, iirc, the per area impact is even lower then a human. It impacts a lot larger area, though!
Plowing vs tilling is also very much about soil erosion and depends very much of the location you are in.
Plowing vs tilling is also very much about soil erosion and depends very much of the location you are in.