I think post-snap penalties should not be called unless they are terribly, TERRIBLY obvious,
Holding, for example, is subjective. How many times have we seen Kyle and Jerry tackled? We never get the benefit of the doubt with holding. Just take it out of the game.
Pre snap penalties deserved to be called every time. Delay of game/False starts/Offside, too many men, illegal formation etc.
its the subjective post snap penalties that can truly dictate the games. i say let the players play.