No they haven't to anywhere near the same degree. Water weight cutting is a modern phenomenon. Marciano never cut water, if he did he'd be allot lighter on the scales
Janitor Jerry Cooney turned professional in 1977. To say his options are limited compared to those of someone who turns professional in 2020 is a vast, gross understatement. I'm going to stop repeating myself now, so if you're serious and you really don't know what they are just go back through thread. In short it would be much more difficult for Cooney to fight at 175 in 1977 than it would for Marciano to make 168lbs in 2020 and perform. I'd suggest that he'd train for 12 rounds rather than 15. But I promise you, modern fighters train like absolute animals; it's crazy how hard they train. OK. We've both been on the forum a lot of years and we both know you're now staging avoidance to very simple questions because they would be devastating to your very weak position. I'll answer for you. Simply by dieting and cutting water, Marciano could make 175lbs easily. He could make 168lbs making some sacrifices associated with i'd bet, better than 80% of non-heavyweight boxing. It wouldn't take anything that extreme.
I don't think any natural super feather would have been able to give a 1941 Joe Louis the fight that Conn did. It just wouldn't be possible.
Janitor, every single ranked cruiserweight is taller with a longer reach. The biggest ranked cruiserweight are taller and longer by distance than every title challenger he had. Equating Marciano with the modern cruiserweight division is impossible.
I said he turned professional at lightweight and today would turn professional at super-feather. Not that he was a "natural super feather" i'm utterly bemused you could even draw that from what I said. Unless you think he was a natural lightweight in his own era?
Marciano was sometimes in the low 190s even in his own day. If he was adding mass, as a small cruiser can do, then he is just a small cruiser.
So do you think men like Ali or Frazier would be heavies today? By the same token, you can argue that they would have moved down to cruiser or even to light heavyweight. You could argue this for the majority of the 60s and 70s crew.