Also, by the time the game has been released for 1 hour, the players have already racked up more playtime than the full QA team could reasonably achieve throughout several years of development (and for most of that time QA we’re playing an older version…). So, if your game has a lot of player choice, randomization, simulation, complex systems, chances are the players are seeing things that QA never did. And then the players wonder how QA could miss such an obvious bug.