Temple days are extraordinary, but they are dense. A well-designed Egypt journey gives you somewhere to exhale afterwards, whether that is a quiet Nile terrace, a coastal lodge, or an unhurried desert morning.
The Red Sea works beautifully after Cairo and Luxor because the contrast is immediate. Aswan can also play that role with soft light, island life, and a slower river pace.
The goal is not empty time. It is time that lets the important parts of the trip stay vivid.