How does the concept of prospective memory challenge existing practices in product design?

The concept of prospective memory challenges existing practices in product design by introducing the need for reminders in products. This means that designers need to incorporate signals and messages into their designs to remind users of future tasks. This can be a challenge as it requires a deep understanding of the user's needs and behaviors. It also necessitates a shift from traditional design practices that focus on aesthetics and functionality, to a more user-centered approach that takes into account the cognitive processes of the users.