I have made the point here before, but the ruling bodies' stand on principle against "bifurcation" ignores the fact that they have made many rules in the past which were different for pros and amateurs.
For many years the R & A ball was smaller than the USGA ball. In the 1970's, the R & A mandated the bigger U.S. ball for the Open and Amateur championships ... but set no timetable for making the average golfer switch over. It happened over a period of 15-20 years, gradually, as the rule was put into effect in county championships, club championships, and on back down the chain of command, until eventually somebody in your foursome insisted that everyone should play the bigger ball.
Likewise, some of the restrictions on clubs which have been imposed in recent years are grandfathered in for a long time for amateurs, but in a much shorter time window for the pros.