4-wheel drive is beneficial where traction is poor or when negotiating hilly terrain. For exceptional maneuverability around obstacles. One garden tractor manufacturer advertises a 6.5-inch turning radius on its 4WS machine. Power steering . Makes steering easier, especially when tractor is stopped or moving very slowly.
Power steering is essential for front loader work.
Hydrostatic transmission . Eliminates the nuisance of changing gears. Especially useful when reversing direction often. Much safer than clutch-activated power train. Very helpful for loader work.