Optical fiber all-dielectric cables have an additional advantage over ones containing a steel strength member. That advantage is:

Rodent resistance is not determined by whether a cable is all-dielectric versus steel-reinforced; armored or gel-filled cables address rodent damage, not the absence of metal.

All-dielectric cables are generally less mechanically robust than cables with steel strength members, so they are not inherently more difficult to damage.

All-dielectric cables are constructed entirely of non-conductive materials such as glass fibers and aramid yarn, with no steel or aluminum. Because there is no metallic path, these cables cannot conduct electrical current or attract lightning, making them inherently safe in environments with electrical hazard exposure. This is a key advantage over cables that include a steel central strength member or armored sheath.

The outer jacket material (PVC or otherwise) is independent of whether the cable contains a steel strength member and is not the distinguishing advantage of all-dielectric designs.