In January 2007, Blizzard released World of Warcraft: The Burning Crusade. This expansion included flying mounts in Outland. You had to reach level 60 to purchase flight training and a mount. You could only fly in Outland, the new continent. In the Cataclysm expansion flight was possible in all areas, except the starting areas.
Now, after all this time, other MMOs are adding flying. Guild Wars 2, in Heart of Thorns, has added flight, well Gliding actually, where you can glide in the whole world, but only for a limited distance.
In a few days on May 17, 2016, Tera is adding flying mounts. Again these mounts have limited range. Why are these games dumbing down flight?