It will be interesting to see what they do with the idols in future seasons...Season 32 was filmed before this one, so they may have hid some idols in challenges on that one as well. But can they really do that again? Once everybody knows they could be at challenges, it will be harder to get away with grabbing them. Plus, the clues are practically useless if anybody can just reach under a plank and find one.
But most importantly, you can't continually hide idols at challenges on a season where, so far, only two people actually know about said idols at challenges. Theoretically, if they are still planning to do that, Wentworth and Jeremy could just keep finding them every single round. Hugely unfair advantage to have for an entire game.