In recent years MMOs have made some big changes. Over time games had been built on this giant leveling curve. Warcraft itself had zones which you played through in times to level up and then basically never went to again. This created a huge vacuum which left most of the surface of Azeroth empty as players moved on. However, Legion has really made the push to utilize the whole continent, something that Warcraft should be looking at in the future.
Read more of Garrett Fuller's World of Warcraft: How Legion Changed WoW.