Kcd 1 and 2 had npc that reacted to your state in the game
NPCs having different inventory, getting in fights, looking around for culprit was also pretty cool and step in right direction

>>714785940
Games i found most immersive were system shock and KCD
Just something about them makes it feel like you are in a real space with real threats
And not everything is made for you to crush instantly with better weapon
I think slower pace definitely helps