The speed at which they fixed the issue, is directly proportional to the backlash they got from gamers.
I bet when they saw a 27% user score on Steam, the amount of threads on forums, including the Steam forums talking about the stutters, the refunds people were doing, and the videos from tech and gaming people, made them reconsider their stance on fixing the game.
If more and more devs feel the burn from not doing proper PSO gathering and shader compilation on load, word will spread and it will become an important focus for Q&A.