Free Campaign Mode

This idea sprung up from me and a friend, and it pertains to the exceedingly confining 10 second boundaries since the Halo Reach era. How about this: for the first playthrough of campaign, have the boundaries so the player stays focused on enjoying the story as 343i intended. Cool. Great. After completion, take all that away. Let the players explore the HUGE, expansive, unfinished areas of your game. I speak for many when I say that finding glitches and ‘secret zones’ in campaign was the best part of Halo 3. It increases the longevity of a game and it makes it more enjoyable.
What do you guys think?

Even goat simulator doesn’t allow this…