It won't have a direct impact, but it will reduce the actual user experience:
DWR protects the fabric by reducing its ability to adhere to the surface, causing it to bead and roll off. The water-repellent properties of W/R&WP are determined by the inherent impermeability of the fabric, such as the coating and weave. Even if the DWR wears off and water adheres to the surface, as long as the fabric's inherent impermeability meets the required standards, it will still prevent water from penetrating, meaning the W/R&WP performance remains unchanged.
However, after the DWR wears off, water will adhere to and soak the fabric surface, potentially adding weight. Prolonged contact with water may also slowly penetrate, indirectly affecting the user experience. Therefore, it is generally recommended to regularly repair the DWR for outdoor products, such as by tumble-activating it or reapplying it.
