The problems with the whole "Let's make very strong Shadowlands cards that will tempt the players because it makes their deck stronger but will have corrupted consequences in the story" are :
- the players that will win events with storyline consequences have to care about the story. Otherwise, they are just super strong cards that have no "side cost". It was seen several times in AEG's time, it will be the same here: not everyone cares about the story, far from it. And when those players win story prizes and it corrupts the clan they played, it "punishes" players from that clan who care about the story and who purposely "weaken" their deck to avoid the corruption when this limit is non-existant to those who don't care.
- it assumes that FFG's storyteam will want to have that degree of impact from tournaments on the storyline, which is far from confirmed. And seeing the mess AEG's L5R story became thanks to the over-involvement of players, I really hope that FFG will vastly reduce it.
IMHO, even if the notion of tainted/corrupted deck was fun, it caused too many problems compared to what it brought to the game, so I hope we won't see it back.