A penance fighter torso has less defence Than a granite body; why would someone use it, not granite?

Question

A penance fighter torso has less defence Than a granite body; why would someone use it, not granite?

Answer 1

This is in the wrong category; RuneScape is not physics.  To answer your question, though, a fighter torso is one of only two armors in the game that give a strength bonus in addition to boosting defense, making it uniquely helpful for aggressive play styles.