realism and visual fidelity are two slightly overlapping but different things.

a game can have great graphics but its npcs be unrealistic bullet sponges. cp2077 comes to mind, not that this makes it a bad game necessarily.

i dont actually want to go to the bathroom in-game but i love me some well written story, graphics can help immensely with that. among other things.

come to think of it 100% realist games would probably be boring