Thomas Grip: A sort unspoken rule in game design is that players should be able to lose. Just about every game has some kind of fundamental mechanic that is possible to fail. Whenever this happens, the player needs to try again and repeat the process until successful. This is thought to add drama, tension and also make the player's actions count.
It seems to be believed that without it games would not be games and instead some kind of boring linear entertainment. I think this position is wrong, extremely hurtful and if not fixed, will become the downfall of the medium. In this post I will explain why.