The force of khāṣṣ is directed to a defined meaning, but application and the relationship between proofs still require analysis.
Three qurūʾ: the number is fixed; interpretation of qurūʾ yields different legal conclusions about waiting periods, revocation and related matters.
Mahr: the Hanafi–Shafiʿi disagreement over a minimum illustrates the difference between the existence of an obligation and a fixed quantity.
Marriage without a guardian: the debate shows why the scope and reconciliation of Qur'anic and hadith evidence matter.
Two kinds of ʿāmm: specified generality and generality without established specification. Keep the original inclusion, excluded subset and remaining legal scope distinct.