indeed.
gta like is a lot (too much) to expect BUT....... there are some very good procedural city generators out there now so some detail is possible
further more wildlife is much easier to do procedurally (look at no mans sky) and on top of that iirc I read that Skyrim was done procedurally - albeit with a wide manual brush painted over the top afterwards.
Agreed. When you are talking procedural buildings it won't be the same kind of tailored/bespoke city that GTA V requires. Enough to give a sense of the environment. Theoretically the size of the city would only be restricted by the speed of the graphics card and cpu and their abilities to display it on screen.