So there I was playing Digimon World 3, blowing up whales (for exp.) when it dawned on me. The world is safe, the final boss isn't doing anything and isn't going to do anything unless I move first. Since I beat the penultimate dungeon, I went on a world tour. Jumping into dungeons and beating up nine uninvolved people and taking their valuables and exp. And when I ran out of big people to beat up I started messing around, which was mostly blowing up whales underneath Amaterasu City.
And as long as I don't trigger anything, the final boss will just stand around twiddling his thumbs. Even though he could have probably destroyed the world twice by now. And it happens all the time. Why won't bosses make a move while the hero is running around in optional dungeons. And we see in games like Castlevania 3 and Chrono Trigger what happens when the final boss goes unchecked.