Oil system myths

The issue of direct oiling to timing chains may have more to do with modern engines than our classics. Engines now often last several hundred thousand miles, and their computer controlled fuel and ignition requiring more precise cam timing. Timing chain wear has become an issue in ways that weren't considered in the days of carburetors and points ignition.
The new oil requirements introduced in 2020 of API SP and ILSAC GF-6 mandate increased protection against timing chain wear. So, it's certainly a modern engine issue.