I know it's just a game and all that, but...
How come 200 years after the apocalypse there's a total lack of industrial activity? People are scrounging 200-year-old food cans for a source of metal and no one has reopened a mine. There's a steel foundry with working furnaces but it's not used for producing steel. There are factories staffed by robots with fully fuelled power cores in the basemant generators but the robots just float around and don't repair the production lines.
The actual Industrial Revolution that started in England in the 18th century only took one generation to change the western world completely. That was in a world where no one had known factories and no one previously had a concept of industrialised processes. So how come the descendants of an industrialised world haven't built any new industry after 200 years?
Although you don't see it in the game, if you can reuse tin cans and pool cues to make a simple section of shack floor then you must have a furnace to smelt the metal and a forge to make the struts and nails, plus saws and planes to shape the wood. If you're going to make a machinegun turret then you'll need solder, precision tools and a yard full of moulds to form the casing. With your band of settlers you could do that if you could find the tools, but wouldn't you expand your operation and start selling products to friendly settlements? Wouldn't people turn up looking for work and making your business grow? Wouldn't you end up with a fully-blown turret factory within months? Yep. You would.
However, I know that the answer is that it would spoil the game to admit that with fusion power, functioning industrial robots, and a population of survivors both above and below ground, the Fallout world would have returned to something like its 1950s idyll within a couple of decades. No game for us.