Too late to deprive the (Fallout) world? The Fallout world has plasma rifles, nano-meds, and cybernetic brain-bots.
The Fallout world is not a 'Cut off in the 1950s' bizarro land. Fallout's setting is their future as might be popularly assumed in the 1950's...(atomic misconceptions and all... it's why ghouls were possible from the aftermath of the war). It means advanced technology, it does not mean limited technology. The Fallout world was not missing tech (except in Bethesda's screwed up silly interpretation of it—they did not design the setting).
It is that a 50's aesthetic was popular and preferred. Everything pre-war is principally designed and looks reminiscent of the 1950's... . That does not mean it's built strictly with 1950's tech. That does not mean they don't know what a transistor is (though it could mean that they don't commonly use them); or them not know what an android is—or be incapable of making a cell phone. Some post-war tech still looks like Buck-Rogers rayguns... but not everything. And those guns don't look like any guns of the 1950's except movie props, and the toys made from them... IE. they look like future weapons as predicted/or assumed in the pop-50's culture.
Also Fallout had new cultures that were thriving—before Bethesda expurgated the IP, and made it stupid. These cultures were not "stuck in the 50's".
*Aside btw: All three of those technology examples actually do have 1950's conceptual examples; and the transistor was made in the late 1940's by Bell Labs.
**I did not make that Ipod example; it's been floating around the web for years... but the point is sound, and it illustrates it perfectly.
If you have only played FO4, or FO3, then you really haven't experienced anything of Fallout—first hand. Everything
* in Bethesda's travesty spin-off series is either a warped ripoff of Fallout 1 or 2, or wildly inappropriate (if not flat-out polar opposite) for the established series.
*Everything... with the possible exception of the Mirelurks.