Answer:
Everyone's parents are different. I had strict parents so I don't know what a nurturing family would be like, but I'll tell you what having strict parents did for me:
With strict (and Asian) parents, the expectations are way too high. When you know you can't meet those expectations, you lack the motivation to strive to do your best because you know it will never be good enough. Without motivation and passion, the quality of performance will definitely go down.