Not knowing what lies ahead forces us to carry rigging equipment, which we may or may not need, or risk having to turn around at a climb or drop. Ideally, we would set long, single-piece anchors made of stainless steel. Few are willing to carry a gas or battery-powered hammer drill on push trips. Although it would be nice to have long, 10mm stainless steel studs and hangers quickly placed at every drop, this is often impractical in deep, wet, body-contact caves. Instead, our equipment usually consists of a fairly lightweight and compact self-drive kit, with enough anchors, hangers, and aid gear to rig several drops or do a short climb.
Petzl gear is easy to purchase, easy to use, lightweight, and relatively inexpensive.
Carabiners and steel quick-links are also easy to acquire. If the project is seasonal, rigging can be removed, ropes can be removed or stashed in the cave, and everything can easily be inspected or replaced before the next season. This still takes quite a bit of time though. However, the reliability of any type of anchor depends upon its proper placement and continuous inspection. Almost nobody wants to take the time to maintain rigging on the way out after a long, hard trip.