I don't need points in any mission, I don't need or want to 'have to' complete a certain task to allow me to continue in the on going war... all that does is emphasise that I'm playing a game, and any reality I'm trying to achieve has just been broken.
In real life not every sortie or tasking works out as planned, and often there are failures and losses. When these things happen, the pilot/unit/squadron has to continue the war the next day and every day thereafter, regardless of the outcome.