Which Points?
The advent of points vs. a fall & time advantage?
Team Scoring Changes?
Match Points?
Advent of the superior decision?
Removal of the SD and advent of the major and technical fall?
advent of overtime in dual meets?
advent of criteria in team scoring events with dual advancement?
advent of criteria in regular season duals?
return of ties in duals?
return of criteria in regular season duals?
First takedown is 2 points, then all of them 1 point?
Back to all takedowns being 2 points?
Falls being 3 seconds?
Falls being 2 seconds?
Falls being 1 second?
You see the issue with selecting an era based on a scoring rule? There's just too many.
A scoring rule change didn't change the number of athletes who could or couldn't compete en masse and how many years they can compete like the FR eligibility did - Divisional Era is probably the most logical, since it set into motion what we have today.
I'm not saying it's THE solution, but given the structure and history of the sport, the two above options make more sense to set clear eras apart from one another.