Why The Passing Of Wind Breaks Wuzu?
You need to know the style of Quran. When an occasions is created, Allah takes up the point and makes it comprehensive by adding relevant details to it, although the addressees know them. For example, 4: 23. They knew that mothers and sisters are forbidden to marry with, but while telling them about the women with whom they should not marry or when to let them go, Allah tells the whole law including the well known practices. Same goes for Wudu in Surah Maida. This Suara is Madanite while the Muslims have been performing Wudu for long. they did not start wudu after this verse. The differences in some minor details are there about what nullifies Wudu. but if one keeps in mind the purpose of Wudu, one may easily infer that any thing impure like defecation or urination can make Wudu null, the other things related to them like Mazi nullifies wudu too.