Yes! It's about overcoming that frustration. Through practice the player can improve. Having a charge bar would be like telling them to memorize when to jump or not when it's more about improving your timing skills. By allowing the player to improve his skills the reward for completion is also much higher. We had a player who's first run took an hour and a half to complete the level, but after an additional hour of gameplay he was able to complete the level in less than 5 minutes!