I'd agree, except sooner or later I want to kill those monsters for their XP. As soon as you start fighting, everything in an area comes down on your head and getting away from them can be difficult. Very difficult. Lethally difficult for "true" rogues with a lower damage output. Hence why many of the recommendations for Sneakiness involve upping first strike damage, giving the rogue more time to slip away into the shadows before surrounding mobs show up on the scene, or making traps more useful and allowing the rogue to deal damage without actually being in the same room as the stuff he's pissing off.