I agree with my pal Runningboar, UncleSam puts a lot of time, effort and money studying and selecting equipment, there is a reason they chose the mag bar.
I grew up near an Air Force base, and we always had those Mag-bars from pilots survival kits kicking around. I've never had a problem starting a fire with a mag bar. The 5400* temps tend to catch fire to anything that remotely resembles tinder.
Make your pile with a hacksaw blade, an SAK saw, a piece of small file, those little scrapers, or your knife blade. It does take a little effort, but, uit takes a lot less effort and time than using a Bow&Drill. I would venture to say, if you were desparate enough, you could use a rock, rub it against the mag bar, and eventually you would have a pile of mag dust.
I like to cut a solid slivver (curl) or three, put them in the pile of dust, to extend the burn time by a few seconds.
Everything else has more to do with basic firecraft, and not the Mag bar itslelf. Dry tinder, out of the wind, good tinder bundle, proper striking technique, etc. etc. etc.
It's like painting a house, it's all in the prep work.
Everyone has a choice of what they want to use to start fires, but, it's nice to be able to use "any" of them, not just rely on one or two "sure fire" (pun intended) methods.