I believe I understand what the OP meant when he posted this thread years ago. I happen to bump into this thread and over the past days I slowly read through it.
Firesteels and survival as a whole are often romanticized. Likely the most by people who know the least. I can attest to that just watching my immediate circle of friends and acquaintances. Add to that that nowadays anyone can become an expert by posting something on YouTube and you end up with a false sense of security.
I've been enjoying the outdoors in all its aspects for all my life. Be it hiking, backpacking, climbing, mountaineering, canoeing, expeditions or simply having fun in the forest. With that I fallen a couple of times in a river, had (too) many close calls (objective hazards in the mountains take on a large share). Actually I fell into a raging river during wintertime, snowcovered banks et al. When we finally got out, I didn't even consider building a fire. I stripped out of my clothes, wrung em out, put them back on and started walking. Granted I was lucky enough to wear a pile shirt. No drama there. I was well fed and able to walk all day. Don't stop and you'll stay warm enough.
Got back from the Scandinavian arctic. Building fire was essential every single moment of the day. In a small group it still takes a couple of hours just to get through your daily tasks of melting snow, finding deadwood, sawing it to pieces, processing it further. Then repeat the same process in the evening. Add to that the short daylight and you spend the bulk of your time caring for the fire.
One day everyone was wet. Temperatures not cold enough as they should have been, hence dangerous. We build shelter and the evening fire. Dragged in a bunch of trees, chopped them up. Then came the intense effort of bringing a fire to life in suboptimal conditions. It involved permanent attention by multiple people, not the least one guy waving vigorously his sit mat non stop. Nobody cared for food, all we cared about was drying out the clothes we had on us, since we were out there for a few more days. We had sleeping bags, but we wanted to have functional clothes the next morning. It took over three miserable hours to get the clothing in a more or less ok state. With vapor coming of the clothing from the get go... and hours later still vapor coming off... you couldn't help but wondering dang how much more water is in there?!
So back to the OP. The example he provided. Building that fire, if you get that far, is not going to solve your problems immediately. When hypothermia strikes, or is about to strike, walk it off. Or dive into your sleeping bag... or two.
We carried a bunch of individual bics and firesteels and solid fuel tablets of all sorts. Then a fancy turbo jet lighter for the group. More importantly we had an omnifuel stove with us for those moments a wood fire won't work. We used it once, although out of convenience. No gas canisters since too cold but we do use those outside of the winter seasons.
I suppose if I was living of the land for a long time I would prefer a firesteel, because of its lifespan. But in a here and now survival situation I rather not use a firesteel. Then again, I would rather have a sleeping bag or big bulky clothing when you get cold.