Same form factor as a firesteel but not mentioned was its combination with Magnesium.
I have lit natural tinders with my little firesteel/magnesium rod where others have failed with the best firesteels and scrapers alone. Incorporating magnesium gives your another 2,000*F+ plus a brief radiant flame... enough to light old pine needles and hardwood leaves regularly.
Fine vs. Gross Motor Skills
Using a firesteel is a gross motor skill. Getting a match out of a packed match-safe can easily become a fine motor skill. Something to consider.
Nonetheless, I carry REI Stormproof matches, firesteel/magnesium combo, bic, fresnel lens, tinder and at the bottom of my fire kit is friction fire (rope, knife). Always on my person though is the firesteel/magnesium.