If Bungie's philosophy on this topic was applied to the NFL, the players would also be the GM, assembling the team, in order to increase the challenge of the game... The race car driver would complete their own pre-race registration paperwork as well as performing their own pit maintenance as part of the challenge... Tom Brady would deflate his own balls before an AFC championship game to decrease the challenge of the game (had to go there ;)... Car dealerships would give you detailed build instructions as well as access to the assembly line to increase the challenge of acquiring your new car... I could go on. It's not the most logical philosophy.