I'm of the mindset that within the first 3 possessions of a game a deep throw of 25 yards or more should be attempted. And for the teams capable of capitalizing on them throw them that often throughout a game. But to only do it once a game at the end... Even if you aren't completing em the attempts should be made to show that you'll do it and keep em honest. Otherwise defenses can make it crazy tough to do what you want when all you're plays are within 15 yards of the LOS