Ever heard of open world? GTA 4? Assassin's Creed? Hello?
Neither of those games has even remotely as interactive as a world. They don't simulate NPC's on any level, they aren't filled to the brim with objects you can interact with, and they don't have to account for players doing things like dropping 1,000 weapons on the ground for no reason.
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Huge cities aren't that great. They get annoying to navigate. It takes forever to get to the stores you want to get to. Most of the NPCs have nothing to say. It's a chore.
Honestly, this. Same with huge house mods in Skyrim. Giant cities seem cool at first, until you have to navigate them. They quickly become a terrible hassle when you are trying to cross them to get somewhere. MMO's are terrible about that, it takes ten minutes to get across most large MMO cities when you actually know where you are going. Trying to find a specific merchant or NPC in a new city is freaking horrific
There's a balance that needs to be met with size, interactivity, and AI quantity for a world to be immersive. The Witcher having big cities doesn't mean it will be good, but let's defer judgement until the game is out. Skyrim, on the other hand, did not meet anything in that balance for me to have enjoyed the game.
Perfection. Where everyone fails. If you expect nothing you can be happy for everything.
Skyrim had to run on 256 mb of ram because that's all the consoles had. Ram limitations of those stupid consoles held back gaming for nearly a decade. Both last gen consoles had ridiculously low ram amounts even for the day. In 2005 pcs had over a gig of ram standard. Consoles had 256 mb.
He who stumbles around in darkness with a stick is blind. But he who... sticks out in darkness... is... fluorescent! - Brother Silence
Because Bethesda is lazy and incompetent and their engine is about as stable as a storm shelter built out of printer paper and scotch tape, so having a lot of NPCs moving about at once would just crash the game into the dirt.
Solid's snake still shoots liquid, it's just that it's null.