This means that certain weapons like, say, the flamethrower are gonna be incredibly bad to use as Survivalist, as he has no access to Firebug skills that would enhance ground fire. Survivalist gives you the illusion of choice, you can pair any weapon you like, but that does not mean that you’ll do good with them. It is a common misconception that Survivalist is a “jack-of-all-trades” perk or that it offers variety, this is true to some extend, keep in mind that you are still bound to your perk skills. You’re the survivalist, your role varies from your perk tree and the weapons you choose from.