Why MUST the differential lock (Differenzialsperre) be disengaged immediately when driving on paved or asphalt public roads?

1. An engaged differential lock forces both wheels on the axle to turn at the same speed, making the tractor resist steering and risking loss of control and transmission damage on high-grip surfaces
2. It permanently engages four-wheel drive, which overheats the front axle
3. It disables the independent rear wheel brakes
4. It locks the front axle oscillation, making the tractor ride unstable