It should be, because it's Fallout, not a power fantasy. Don't go full Bethesda on me.
Except Fallout was never an accurate representation of anything. Not even Fallout 1 pretended to be accurate. Also, not being 100% accurate =/= being power fantasy.
Not to mention Fallout's notoriously inconsistent dealings with nukes
>Las Vegas was targeted by 77 warheads
>House disabled 68 of them
>The other 9 hit the surrounding area, causing basically little to no damage to the environment, failing to even irradiate the water of Lake Mead
>Salt Lake City was targeted by 13 nukes
>All of which hit, completely destroying the city to the ground, and causing the great salt lake to evaporate
>Los Angeles was hit by an unknown number of bombs, but the devastation was neither so great as to destroy the city entirely like Salt Lake City, nor was it so little as to leave tons of intact ruins everywhere as it did in places like Chicago, and Bakersfield, and for reasons unexplained reduced the city to nothing more then skeletal frames of buildings
>The Vault Dweller detonated a nuke in LA at the end of Fallout 1
>Despite the mass amount of radiation this would have unleashed, and the massive number of ghouls it would have created, LA is somehow a perfectly fine and intact city in Fallout 2 and NV, one of the NCR's largest, home to the Follower's University, and the NCR's printing press, with no one mentioning any sort of nuclear damage
Its almost like Fallout always set arbitrary and totally random levels of nuclear devastation/radiation to whatever was convenient for the plot at the time.