Suspicion: +80% of paladin playtesters in their closed group ended up with the broken oath state at that point, from dealing with the fishers and having some of them die due to failed checks and no fault of their own, so they doubled down on the flippant system and just removed the 'problem point'.
Ooh, that didn't occur to me but it sounds plausible. If so, then hopefully the writers will be able to resolve the issues and give us the fishers back. Ideally along with a more nuanced representation of what it is to adhere to or break paladins' oaths, though I'm trying to reserve my judgement on how the game handles oaths until I've completed my paladin playthrough.