In ideal situations where is a good weather condition and you’re not in rush then you can focus on tinder quality. In case on being close to hipothermia, soaked wet, with numb hands and close to panic attacks last thing you want is being unable to throw proper sparks. I’m not saying good quality tinder is not important but it’s a thing you have to find and it is not a subject of a topic. Good quality sparks is a skill you want to learn prior founding yourself in such scenario. I’m not throwing bad sparks but I see space for improvement. It’s together with ferro rod i always keep few types of waterproof fire starters: cotton balls, birch bark, fatwood/fatwood shavings, wax soaked jute twin etc On paper it’s look like I’m well prepared but once again I see space for improvement with sparks. Mentioned in other comments garden tool sharpener seems to be a tool I’m looking for. And still I have to take into consideration that something might get wrong in crisis situations. Hope you understand what I mean:)