IMHO, they weren't Tyson Fury, Lennox Lewis, or the Klitschko brothers good, but they weren't as bad as many today think either. To answer your question, there are more big guys in boxing in modern times, so it stands to reason, there would be more good ones around.
Cause many lacked coordination and cause they didn't knew how to use their height and reach to their advantage.
That's actually an interesting question. I'd like to hear the explaination from people who usually are low on oldschool fighters period. Think about it - if fighters were less skilled back then, shouldn't it be easier for people with physical advantage to dominate the sport?
I think that it probably comes down to the simple fact that there were less of them. Less big men means less chance of getting as good as a Lewis or a Wlad. Willard, Fulton, Tate, Carnera, Impelletieri, Baer, and Simon were not in any respect bad fighters, they just weren't as good as the giants of more recent eras.
Man give Carnera some slack, from what I remember he had a career defining injury to his land or leg in some way and was considered pretty fleet footed, and had exceptional footwork at one point. But as he got older, the injury didn't heal and he more jaded to the sport I honestly felt like he typecast himself and the literal big bad of the division and fell in love with his punch. Which while it could put people to sleep, his archtype became his fighting style when Primo was capable of more. He spent several years rated a top 10 contender by the ring. Carnera would give modern Super heavyweights a problem, he would imo certainly be a top 10 contender at the least, and likely top 5 contender of the division in the current climate.
Probably not, but he might well have beaten Michael Moorer for example. He would have stuffed the big men from that era, who were not all that.
Theres really no proof for acromegaly medically. Primo just looks weird. But he didn't have acromegaly for certain.
Willard started deep into his later 20’s w zero amateur background. He was actually very good considering his very late start. Fulton was very good but lacked the chin.
Abe Simon was diagnosed with and treated for Acromegaly. I remember reading an article where he even talks about it. Not sure whether it was before, after, or during his boxing career. He had all the classic symptoms, including the big brows and the hair all over his body. Carnera not so much.