Umm, what about Eastern Catholic clergy? Celibacy was NEVER a thing for them until some Irish-American Catholics made a stink about it in the early 20th century, and the Holy Father, in just about the only move I've agreed with in his entire Papacy, ended this discrimination against Eastern Catholic men in the diaspora.

Celibacy is a discipline, not a doctrine, (and one unique to the Latin Rite,) and this is private revelation and thus not binding on anyone.