Primarily I think this should be added to keep you from forgetting to move blueprint before the blind starts for perkeo/burglar or move a dagger to the right. But it could also be a nice accessibility feature for disabled players to make it easier to copy a mime before gold cards/blue seals trigger but after the final hand starts to score.
Obviously it wouldn’t need to trigger a confirmation box if you didn’t actually have any jokers triggering at that phase that cared about jokers position.