Having different facial expressions for the characters will make the game more realistic and exciting. Expressive faces will help to convey the emotions and states of the characters: joy, sadness, fear, rage, etc. This will make the gameplay more exciting and allow players to dive deeper into the game world.
Along with facial animation, the developer can add small details such as changing facial muscles, changing eye expressions, eyebrow and lip movements. This will create more unique and distinctive faces for each character.
In addition, working on facial animations will allow for a stronger connection between players and characters. When characters express emotions, players will feel a greater connection and empathy with them, making the game experience more memorable and engaging.