Because after playing the game for 15 years and mastering every character in every skill (yes, even summoners), the game left only a couple of challenges outside of the Deep Dungeon. And despite it probably being my 2nd favorite game the only thing left to try in it are self imposed challenges like sending 2 or 3 characters in Bariaus Hill or Finath River alone (I was on the tail end of Chapter 4 in a newly started game to test that theory...again, when I heard about v1.3). I've beaten the game 2 or 3 times, but I usually never bother to. I just run around the land going to Finath, Bariaus, and DD.
So for me the overall enjoyment of FFT never left but the challenge of it lost teeth. This patch is the denture set... a vampire fang-sized denture set.