inmersion.
After Ultima VII, the closest thing i could experience to real world inmersion was Gothic, but that was near to 1/10th of the complexity Ultima VII had.
Ultima VII was released in 1992
Gothic, in 2002
Ten years of difference and the genre actually devolved, that was something depressing.
Ultima VII had lots of NPC, no loading areas (the whole world was there the whole time, be it dungeons, towns, sea, whatever).
Each NPC had a schedule, for example the guards would turn on and off street lights while patrolling, the baker would make bread, and everyone (excepting the guards, of course) would go to lunch and dine together. Even some days some of the NPC's would get together in the tavern and start singing and playing in a band. While some others would go to their theatrical class.
As for you, you could get a bucket, fill it with water from the well, then get some flour, mix it with water in a table, use a rolling pin and then bake some bread.
I could go on and on about these little but really inmersing details, but you get the idea, nothing ever came even *close* to this, and we are talking about a game 17 years old.