Placing them elsewhere can be important for defending against certain attacks, like thief and pirate ship, it can be useful for working with hunting party (though in both this and the venture example, I don't know why you've bought stashes), and when you reshuffle in the middle of drawing a new hand, and that hand is too strong or too weak already, you can stuff them back into the next hand. In general though, they're more or less on top 95% of the time, exactly literally on top like 55% or something.