This is true, but the 737 entire vert. assembly did not break of the aircraft. That was due to a PCU servo value that jammed, not the design of vert stab unit itself.

I would deduce that once the rudder limiter disengaged, the rudder travel exceeded those "limits" and was sheered completely off the aircraft at altitude. Because of its shape, it would have fallen relatively gently to the water, which is why it remains intact, unlike the rest of the aircraft which would have had a catastrophic collision with the water, hence the small pieces they are finding.

Airbus really needs to take their pride and shove it where the sun does not shine. Fix the flippin' issue.