About the daughters of Zelophehad

Regarding the story of the daughters of Zelophehad, there are two appeals to God for clarification of the law, one by Zelophehad’s daughters themselves, and the other by Zelophehad’s brothers (the descendants of Joseph), and in both cases God grants their words. The question is, what would the law have been if there had been no appeals for clarification? And did God not know that the law was this way before the appeals for clarification? And perhaps the very appeal led to a change in the law? Why did the Torah not address the case of daughters without a brother in inheritance laws before the appeals for clarification? On the surface, it seems that God does not really care what the law would be regarding Zelophehad’s daughters and his brothers (and in general for similar cases of daughters who inherit), and only when they appeal to Him does He justify them, and if they had not appealed, they would have remained in their predicament. Perhaps we can learn from this story that the commandments between a man and his fellow man are not rigid commandments, and that they can be changed according to changing reality and logic?