I'm well aware on how PotD was built and what it was intended for, however a challenge is not repeating something you know you have mastery of, going back to floor 51 is just an attempt on SE to ensure players have a decent pool of players to be matched with in order to progress. You're not growing in skill for going back to floor 51 with 99/99, running through bosses that are FATE level of difficulty, if you wiped on floor 170 from the boss because of it's mechanics redoing story based levels isn't helping you understand a boss fight on a set of optional floors. A player that has access to 101 would already know how items and traps work as they have seen it previously for 100 floors, so you're not learning here on how to manage items or traps, it's a development choice that honestly has no real benefit to redoing once one has proven capable of handling.
