It would be a shame :) will not even try to argue about that, and that is what makes this game so special. You just always need to have a fallback plan.
And remember it works both ways, sometimes you can hit a guy hidden by shield wall with mere 5% of chance to hit right in the kisser :) No way on Earth could you have planned it, but the opportunity is yours to grab and you need to adjust the strategy and be very flexible about it. That adds a tonn to replayability :)