Now you are going back to the "70's" and earlier. Lassiter,Mosconi era, ..... and yes I will agree they rubbed the rail a time or two.And I can show you about 100 videos with them playing for fairly decent money (at the time) on absolute buckets, and they still brushed the rail unnecessarily.
That vid I linked I happened to watch, and Sigel "rubbed" the rail once out of 150 times. I would take those odds for my playing ability anyday.