There are a lot of "expert" opinions here that need correcting. The Shadow please note:
This apparently happened three times and on the third occasion the nosewheel oleo snapped off (thereafter no hydraulics, no nosewheel steering, no directional control via rudder, no reverse and MLG braking only from the brake accumulator - about five applications before it's empty).
The 737 has two independent hydraulic systems "A" and "B". Even if system A was completely lost when the nose gear sheared off,(nosewheel steering was no longer of interest) Rudder, No.2 Thrust Reverser and Normal Brake system still powered by sys. B.