I already asked Bright Sun and the answer was that this was the only 'finished' content that was removed. A few ideas were partly implemented but later removed due to not working correctly. They might return in future versions, but Bright Sun said that those features were removed long before the beta bug test version (I think this was really like early alpha version stuff).
One thing of note (at least to me, since it sounds fun and I hope it will return eventually) was that a trading card (collecting) mini game was apparently removed very early on. I think it might have been similar to the card game in Their Beautiful World, but I don't know much about it.