That's how things went...

Time was seldom kind to those creatures that existed temporally and linearly. It was why the Nenn avoided getting mixed up in temporal affairs. It was an adjustment to the senses to have to see the universe in tiny segments, instead of all of time and space simultaneously, which was quaint but not terrible. The terrible part was having to see those bits in a chronological order, watching the mortals grow and blossom, and just as soon as they had Learned, they withered and died. So the Nenn stayed away, avoiding that plane of existence because it would burn them.