وَلَمْ نَجِدْ هَذِهِ الْمَسْأَلَةَ مَا يَتَعَلَّقُ بِهِ شَيْءٌ مِنَ الْأَعْمَالِ
We do not find a specific practice whose performance depends on this question.
Some questions require general assent; others bear directly on a practical obligation. The precise preference between ʿUthmān and ʿAlī is not a condition for valid prayer, fasting, or other basic acts of worship.
This does not render all doctrine unimportant. It shows why understanding the practical bearing of a dispute helps assign the proper weight to it.