I assume it leads to a longer "cleared approach" phase and a shorter "cleared to land" phase and as a courtesy to the pilot behind, clearing the runway as quick

I assume it leads to a longer "cleared approach" phase and a shorter "cleared to land" phase and as a courtesy to the pilot behind, clearing the runway as quick as possible. Taking a quick look at Heathrow approach, looks like runway is clear of the first plane landing when the following plane is 1-2 miles out and around 500ft.