I mean, we have Tribal Power Armor from The Pitt. There's also the Boomers with their artillery and that Bomber, among other things. not to mention the Canaanites learning how to use m1911 (not called that in-game but it's that gun). I'd imagine Tribes varying in tech levels, maybe some discovering technology from various means and practicing with it. Would explain why even Raiders such as the druggie Friends can use Energy Weapons and the "raiders" of Fo4 (ffs really? Just "raiders?") can even construct PA, among other things just fine. With Nora, she's just woken up from a 200+ year stupor and can find the closest PA (either the crashed helicopter or Concord) and use it immediately with no obvious training as well as know its capabilities (inertia cancelling for example aka no fall damage, which already is an issue by itself).