4. Similar to World Championship Wrestling: Wrestler creative control.
The WWE is a massive corporate entity, and there are advantages and disadvantages to that.
When a match takes place on RAW, for example, it is dissected by up to a dozen different people, including CEO Vince McMahon, and analyzed step by step. This is done to streamline their future matches, to take into account how the live crowd and people at home reacted to the show.
However, it can be very frustrating for a performer to have management constantly interfering with their matches. This was one of the major lures of WCW; Men like Hulk Hogan, Macho Man Randy Savage, and Kevin Nash were all allowed to book themselves and maintain creative control of their characters and matches. While this was a good thing in Savage's case--the man had a great mind for business, and saw that DDP would be a future star and helped make it happen--it also led to a lot of situations where the company was put in a difficult position. After all, both Sting AND Hogan can't win the same match.
AEW seems to be hinting at giving wrestlers a lot of creative control, and many are saying this will lead them down the same path as WCW. While that remains to be seen, it is true that many wrestlers will feel AEW will be a more fertile ground for their creative impulses.