Since it was the first I heard of it (especially in suspension parts (Ford)), I was a bit taken. Since, considering clamping force and vibration, I thought it was critical. Now, I think it is important, but not critical, especially considering material inconsistency and thread-hangup.

After doing one, I think I measured the torque afterwards; I can't clearly remember what happened, but I think it was a few pounds past the torque specification. I don't know why the straight torque (with tolerance) isn't sufficient in these applications -- so, that is my personal summation. Plus, I don't think a gauge is quite necessary - just observation of the angle turned-through.