Speaking with Automaton Media, Sucker Punch revealed to have adopted the same vision. They didn't want to have to produce filler content for a much larger map. However, they did make sure to make the map feel grander, which is appropriate since this setting is much larger in real life than that of the previous game.
Ghost of Yotei includes various systems and details aimed at making exploration feel free and rewarding. For example, running through flowers increases your movement speed, and if you follow these flower trails, you might discover hidden secrets. We've also added new items like telescopes and binoculars to allow players to enjoy the scenery. All these details work together to ensure that players won't get bored even on a large map.

Ghost of Yotei Has a Similar Sized Map to Tsushima, But It Has Been Designed to Feel Larger
Sucker Punch said that the map size of Ghost of Yotei is similar to its predecessor's. However, this map will feel larger due to its design.

Ghost of Tsushima's map size was perfect, it's good to see Sucker Punch isn't making it even bigger for the sake of a sequel, and is instead doubling down on quality over quantity.