As you can see here, the only discrepancy is FO4 being smaller than WoW, however I haven't put very many mods in it. At the largest, my Skyrim PLAY folder was up to 128 gigs with mods. All of the DLC + the community DLC, 4k textures, other new quest areas, so on and so forth. At that time I was so desperate for content in a game I enjoyed I wouldn't install the mod unless it was base-size 500mb or larger. Assuming we'd need quantum computers for a game ~100gigs in size just shows a severe lack of real knowledge of what computers these days are capable of. If that's the case, I should be next in line for a Nobel Prize considering my computer can handle something like that no problem thus it must be quantum.