Rts elements bring a dynamic aspect to visual novels. Visual novels are often text - based with some static images. But when you introduce rts elements such as time - sensitive decisions or resource management (even if it's more abstract in a visual novel context), it creates a more engaging and immersive experience. For instance, if you have to manage 'relationship resources' with different characters in a limited time frame in a visual novel, it mimics the strategic thinking required in an rts and keeps the player on their toes.