The Domane seems like a good choice. An endurance frame that should be comfy and should allow you to enjoy longer rides on weekend.
My commuter is a gravel bike. If I only had 1 bike, I'd either keep the gravel bike only and ride 2 set of wheels or I would by an AR (all road) bike.
Have you consider the Giant Contend? It would give you more bang for your buck for sure.