I really don't get this MB criticisms to Roberta. It's the same for every setters. She is trying to play fast to beat the blockers. China have big blockers at left side. The slide should be not that effective against China.
People should take reference with Japan vs China in the quarterfinal of London Olympics. Takeshita barely went to her MBs and it worked. This is how you defeat taller teams. I imagine most teams have copied this style. You can't think and let the muscle memory take you. It's like shooting 3s. Let the instinct take over til you find the comfort to go wherever you want.