Let's see this evidence
Easy. Viator, got fat, died at 62.
Arthur Jones. Aged badly. Shrivelled up look to his physique for the majority of his adult years.
methzer bros. Both had health problems in their 40's that was permanent. Both had stopped training, got fat, looked older than they were. Both died in their late 40's.
Yates isn't even half the size he once was. Arms are like spaghetti twigs.
Compare the volume guys like Vince Taylor who was still in great shape and competing in his 50's while the hit guys had injured themselves and or burn themselves out with hit.
Lou Ferrigno, Arnold Schwarzenegger, Bill Pearl, Serge Nubret, Dave Draper, etc were/are still training into their laters years while the hit guys had stopped completely. All that going to failure guff tires out the cns quicker and causes early burnout and injuries. Hit sucks.