I think that's not true. The old timers tended to be within 10 inches of the object ball and have a 60-degree cut. In comparison, Hohmann is 30 inches from the object ball and has a 30-degree cut. I think Hohmann hits the ball a lot harder than Willie did.
And my memories of playing on new Stevens cloth in the 1960s is that the balls spread just fine. When new.
Agreed that Hohmann (and Feijen) hits the break shot as hard as any player I've ever watched not named Lassiter, but today's best, as a rule, hit the break shot quite a bit softer than Hohmann or the old masters. The old timers, as you've noted, got closer to the break shot than today's players by playing the patterns more skillfully, but they still got stuck more often because of the nappy cloth.
It's also true that the old masters paid a bigger price when they got a bit too straight on the break shot than today's best, because the extra power needed in such situations was harder to produce.
Finally, new cloth was not the norm in the 14.1 tourneys that I attended in my youth.