This allows you to make up a bunch of 2LDs in documentation e.g. https://cat-food.example/ https://dog-food.example/ and https://pet-food.example/ might be three different companies that sell pet foods, or they might all be brands of the same company, whereas if I used names like https://cat-food.example.org/ and https://dog-food.example.org/ that's confusing because we'd say it's very unlikely for rival companies to share a 2LD this way.