You cannot know too many different techniques for starting fire. You just don’t know what dire situation you might find yourself in one day, and you just don’t know what resources you’ll have with you… Matches get wet, lighters get broken, and pretty much every other gadget/device for creating fire can be forgotten and left at home. Sure you could forget some steel wool, but the more methods of starting fire you know, the better the chances are that you will be able to do so in different situations.
I think everyone should pack a handful of steel wool in their camping/hiking and survival bags. It is just so easy to start a fire with steel wool, it seems silly not to carry some. The link below will show you how to start a fire with a flashlight and a battery, so that’s two different ways you can start a fire if you have a flashlight and some steel wool!