I think over-strictness became a problem with JW's at the point that they thought the end was coming in 1975.
The whole organization thought they were marching into the promised land in military order - like the Israelites in the exodous.
Everything was tightened up. Even the new smoking rules were instituted in the context of purifying the congregation for God's approval just before armageddon.
The article that launched the no-smoking rules was titled: Keeping God’s Congregation Clean in the Time of His Judgment
THE TIME FOR DIVINE JUDICIAL DECISIONS
26 These rulings with regard to spiritual and moral matters of the Christian witnesses of Jehovah may appear to some to be very strict. But this represents no effort to act in an arbitrary, dictatorial manner. The strictness really proceeds from God, who expresses himself through his written Word. In view of the time in which this generation of mankind is living, it is the time for careful attention to cleanness of conduct by those who desire to please God and to enter into his approaching righteous new order.
That article came out in June 1973. That was 40 years ago when they expected the outbreak of the Great Tribulation even before the end of the 6000 years in 1975. From that point on JW's went crazy. The leadership in local congregations was expanded from one overseer to many overseers. This meant that every Tom, Dick and Harry could now qualify as local governors and to do so they had to have "theocratic" children. Basement parties were over. Congregation picnics started to disappear. Responsibiity in the congregation from mike handlers and attendance takers to litterature clerks were stepping stones to ELDERSHIP and any evidence of deviance had to be monitored and punished.
After all, with armageddon so near everything became a life and death matter.