For a London–Paris journey, Eurostar makes Gare du Nord an arrival point within the city rather than a transfer to get through. The useful question is how St Pancras, the train, luggage, the hotel and the first Paris address fit together in real time.
Charles de Gaulle and Orly can be right for a different itinerary. The decision depends on the origin, arrival hour, people travelling, first neighbourhood and what needs to happen after the key is collected.