I know what you are saying. I used to think this way about dancers too - they are "too acrobatic". However, the styles are changing from the past. I personally think that Diana has danced this beautifully and with split second timing and poise. She is certainly not having a "bad" day. In fact, I think she is having a brilliant day.
My God, she's brilliant! This is probably the best Vishneva video on RU-vid, (thank you!)everything considered. I wish there were more commercial DVD's of her available. We had good quality commercial video of Darcey Bussell from the time she was 20 right to the end of her career. I am concerned that not enough good quality footage is being shot of Diana in her youth.
What starts on 3. 52 is duende, it's the most amazing thing, one of the most amazing things I've seen in all my life, and thank God I've seen it on stage.
At 4:26, she gets very close to the edge. She must be completely confident and fearless. A couple of inches further, and it could have all ended in disaster. She is very very talented and musical.