Fallout is a product of its time. A post-apocalyptic setting with a sheen of 50s Americana commercial propaganda must have felt scathing in the late 90s, when the dying Moral Majority was still trying to make life miserable for normal Americans with their hypocritical lecturing and endless purity spiraling. We, as gamers, accept the setting even now because it's what defines Fallout... but if you were to come into the series fresh, I don't think you could fully appreciate the point of the game's setting.
My point is an adaptation made now, even if it's faithful to the best of the games, is going to feel kind of toothless in an age where the Left has fully metamorphosized into the new Fundies. And we know they won't follow the games because it's the people behind Westworld, so... who needs or wants this show?