It's an important point that the first fire is really important so one had best carry what will really, really work.

I find it difficult to practice. My winter hiking area prohibits fires so the idea of hiking out a ways and taking a break by kindling a practice fire is not possible.
In that case the most important fire is the one that happens when I turn the key to start the car to go home.

I've not yet had reason to start an emergency fire (and hope I never do!)