The trade-offs between elements adjacent in space versus stacked in time are always in the mind of a UI designer. Placing many elements on the same screen reduces the need for navigation and gives users a comprehensive feeling of “it’s all at my command.” Moving focus from one element to another is instant and seamless. On the flip side, separating elements onto different screens slows things down with navigation while increasing clarity. There is more room for explanation and luxurious space when fewer elements occupy the page. The eye has less to filter through. The course of action is more obvious.
From Ryan in the Article ‘Learning from bad UI‘