I totally get what you mean, the enemy demo does have cinematic lighting. I think there is room for both: 1. cinematic lighting, which many people falsely identify as the most realistic or prefer because they are used to how reality looks in movies, 2. realistic lighting, that tries to render something our eyes or a camera would see in reality, which seems more immersive to me. The choice highly depends on how the game should feel. Using GI in general does not work against realism though, putting artificial area lights, flaming chess pieces and such does. They just went for a cinematic lighting in that, based on HDRP, which gives you the base to go for a more realistic style as well.