Guys always think they know everything there is to know about training so don't listen to advice. I can try to talk with bodybuilders but most stay the same year after year and train very hard just to do that. They literally do not believe me when I tell them they might benefit by doing what I say. For example, I have advocated training only arms for a month. Do you think any bodybuilder would dare do that? You see, so many beliefs are established that it would take a complete abandonment of their theories and they are never going to do that. What do most bodybuilders believe about size? That you need drugs to get really big. Well, if you really believe this then there is no point trying to get huge naturally. I have discovered things by accident. For example doing less and finding it leads to more growth than just the muscles you are targetting. The body is a system and the arms are connected to all the upperbody muscles through the shoulder girdle. So if you train heavy for the arms you are also training heavy for adjoining muscles. Nope, most don't believe that and insist on training all bodyparts each week. That is one of the erroneous but entrenched ideas that prevents most from getting very big.
It is clear that most are not doing the right thing re training because they have stopped growing. You see that with the pros, too. Most are the same year after year. Or they get worse.
The one inescapable thing about advanced bodybuilding is that it is always dangerous. You have to keep doing something that will generate growth and this is very difficult to sustain. I think it is possible to sustain but I doubt many have the capacity and motivation to keep training that way. In a very real sense bodybuilding is mostly a hope enterprise because there is little in the way of cause and effect. In science, if you do X you will get Y. What happens in bodybuilding is you do X, P, Z, and T and hope for Y. It is so far from a science that I don't know what to say. If you look at the proliferation of theories re hypertrophy then it is obvious that all of them cannot be true. That means most only overlap with some of the truth. I feel confident that most methods cannot generate maximum hypertrophy. If you look at the vocabulary and theories then the unavoidable conclusion is that this activity is more witchcraft than bodybuilding science.