I have a few fire steels none of them that ½ by 4 inch one. And they work well. I do notice the bigger they are the more sparks. This means I have talked myself into ordering one of those big ones to play with. Actually a few of them (my 18-year old son will want one) and I like to have spares of most things. Need it? NO! Want it YES!
The signaling aspect of it is interesting, never thought of that.
Well mate, what fits in your hand may not be practical for a pocket. I think these rods may be good for lighting a fireplace at home but are a bit large for field carry. Thats just my opinion, If you think otherwise then thats your right. BTW, I happen to think that the mini-keychain ones are really silly as well.
I carry a Swiss Champ Swiss Army Knife, it’s the biggest one they make. I have had it in my pocket every day for 30-years. I feel naked without it. It’s big, bigger then most people would want. I have left for work a few mornings without it and then turned around to go back and get it.
I think while an item may be big it still can be very useful and like my Swiss knife people will see the worth of having it.
I also agree that the small key chain fire steels are of limited use because of the small spark. I have a few of them but they are now with my camp stoves, they produce enough spark to easily light gasoline, alcohol or propane. I have a pouch that I put my Svea 123 stove in, I hooked a fire steel on the cinch strap of it so it’s always with the stove.