Frankly, I would not put a lot of emphasis on flintknapping as a survival skill.
I wouldn't either, but the same could be said of traditional firemaking. Some people just enjoy it as a hobby as opposed to a critical survival skill.
Au contraire, mon ami! By contrast, building a fire is a bedrock, absolutely necessary, fundamental survival skill. If by traditional, you mean a non industrial (i.e., no match, lighter, etc) but flint and steel, bow drill, etc. and natural tinder, I suppose it might be a peripheral kind of pastime. But you never know when a hobby might be useful....