People would just skip the content if they could fly freely. It would break the game. Honestly, this falls within the category of "things players believe they want but that would hurt more than benefit the game". HOW exactly would it break the game? The Roller Beetle is in the game and it's not broken. You can zoom through a map in seconds with that mount and yet the game isn't broken. The Skyscale can basically do the same thing if you find a high point to start from so why not just make the damn thing just FLY from any point? The mechanic is NOT fun, it's not challenging - it's annoying.