What if the reason Bungie overlevels the end game is to make it easier later? maybe, just maybe, the reason Bungie chooses level instead of just bumping enemies to do more damage and have more health is so that the task DOES get easier after a dlc release, so those unable to do it before can do it now?

I know. Crazy, right?

Don't get so caught up in the level thing. Its essentially arbitrary. Coul just make new enemies that do more damage and have more health to have the same effect of pressure on the player.