Urgency is demanding attention. Attention is achieved by raising interest in other humans. For products, this raising of interest is known as 'marketing'. There is a very fuzzy line between passive marketing and active marketing in products. If you turn on a notification in your app just so the user uses your app again, you've crossed the line and are contributing to a global 'arms race' of marketing behavior that is slowly eroding everyone's joy. Please stop what you are doing and just make your software great.