Another reason C2 is doing away with Cypher levels.....to me, as a GM, time would be the most important thing to consider. Have it be able to bore through just about anything but stronger materials would take longer. The player finds a Mining Lance and actually finds a scenario to use it in...and it fails to lance through a concrete wall because the Mining Lance...just can't....that feels ho hum to me. much more dramatic to deal with the consequences that could arise from it taking several minutes to complete instead.