https://www.pcgamer.com/jetpacks-are-coming-soon-to-fortnite/

Think of a compromising situation, a worst-case-scenario type dealio. Got one? Okay, now add a jetpack into that mix. Better, right? If there's a circumstance that jetpacks can't make better I'm yet to hear it. 

Fortnite understands this, which I imagine is why jetpacks are "coming soon" to its Battle Royale variation.