One of the most annoying thing about the kiddies who have only played the 3d Fallouts is that they insist that the Fallout universe, both pre and post-war is stuck in some sort of 1950s stasis. Sometimes firearms in New Vegas are labelled not "lore-friendly" because they were designed more recently than the early 60's and have synthetic stocks. While Fallout 1+2 were retro-futurisic styled, particularly anything related to the pre-war world, these were aesthetic and thematic choices (contrasting the optimism of post WWII America with the horrific realities of a Cold War gone hot) rather than a concrete depiction of the lore of the world. And while the world of Fallout was intentionally pulpy, the influences come not just from old classics such as Forbidden Planet, but also from post-60s sci-fi with a more cynical view of the future, such as A Boy and His Dog, The Road Warrior and Warhammer 40k. Saying that everything in the Fallout world should be straight out of the 1950s is like saying that all the female characters in Futurama should be wearing miniskirts because the world is styled to look like what they thought the future would look like in the 1960s and has lots of references to classic Star Trek.