The main reason was that many of the threads were sharing links that were dead, due to MEGA changing something in the background, thus rendering many of the posts here useless.
It also was done due for the sake of keeping everything current, as some of the posts were as old as the board itself, and only showed how dead the board is. My hope with a fresh start was so that people finding the board don't see months old posts with no replies, and no longer feel inclined to reply to anything.