(Note: By traditionalist I mean a Catholic who associates with and holds the views of groups including the SSPX but also other, more extreme groups, as opposed to a Catholic with a love for traditional devotion and liturgy but does not hold malice towards VII, the N/O, etc.)
In 1666 Patriarch Nikon of Moscow instituted liturgical reform to bring Russian liturgical practice up to speed with contemporary Greek practice. A group of RO’s revolted and formed the Old Believers, rejecting Nikonian liturgical reforms and keeping the old Russian liturgy and while some reunited centuries later (“United Believers”), most stayed in schism. Some went as far as to say that the entire priesthood was annihilated by Nikonian reforms, and only baptism (if that) remained.
In 1970 Patriarch Paul VI of Rome (:D) promulgated a new Missal to fulfill the conditions of liturgical reform discussed at Vatican II. A group of Catholics rejected these reforms and became Traditionalists, rejecting the Mass of Paul VI and keeping the old Latin liturgy, resulting in multiple schisms, and while some have retuned (FSSP), many remain in schism, and some go as far to say that the priesthood and Mass were invalidated by Pauline reforms, the Pope is an antipope, and only in their own sect(s) remain the sacraments.
Does anyone else see a parallel?