I wonder how different the game would be if you had to declare your action and if it turned out you couldn't do it, oh well, nice try, no action for you.
Not *that* much different other than being much more careful on questionable boosts/brolls/locks. Doesn't give much impact on higher skilled players while punishing lower skill players unnecessarily. It trims out a modicum of 'cheese' like measuring overly long locks but doesn't gain much benefit for how much it hurts weaker players imo.