Squeenix do this a lot, tbh. In Kingdom Hearts BbS I am pretty sure you had to do a lot of nonsense to get the final chapter to unlock. Gives you something to work to, I suppose. Some people find it tedious, others don't. I had fun doing everything in FFXIII-2 (and BbS for that matter), and clearly SapientiaXIII did too. Just gonna have to agree to disagree on the fun part.