You're telling me that you didn't like FO3 designs?
Correct. The worldbuilding had lots of things to explore, and this was good. Better than Oblivion's exploration, considering how Oblivion was basically dungeon copypaste.
However, the problem is that none of the worldbuilding in FO3 made any
sense when you start thinking about it. It's two hundred years since the war, yet the most anyone's done is build a town of scrap-hovels? Where do these people get their food? Or their water, given how the plot revolves around it being radioactive? Why are there all these unlooted dungeons around? Why is Canterbury Commons a trade center when it's well away from the actual trade routes? Why do they even use bottle caps as currency? Out west they were backed by the water merchants of the hub and represented a bottle of water, but back east...? How are the super mutants keeping themselves supplied? Where do all the chinese assault rifles actually come from? Why are the hillbillies more deadly than Enclave shock troops? Where did the Brotherhood get all those suits of T-45d PA?
NV, for the most part, fixed all these things. There were gun factories, farms, trading posts, etc. Factions traded with one another, and in general, the world was built for plausibility first. That's why NV's worldbuilding is better, because it comes off as a place that could actually exist, as opposed to a theme park that exists solely to provide a place to explore.
Hence, I think it would be a good thing if Bethesda were to appropriate this trait for FO4. That is, build a believable world and then populate it with dungeons and easter eggs, as opposed to simply starting with a bunch of locations and then trying to figure out how they fit into the world. The problem with NV was that it didn't have enough of these dungeons that weren't connected to quests. I've got a mod that fixes this, and it makes the game far more enjoyable. Bethesda dungeons with Obsidian worldbuilding? Yes please.
Then I think they should appropriate the DT system (and combine it with DR ala Fallout 1 and 2), as well as ammo types, because these mechanics add
massively to the depth of the gameplay too. It's not just "write better, kthanxbai."