Reading this thread is interesting because as I've said to others so many times, there are so many so-called "trainers," but nobody talks about them 2 days after they leave the industry or die. Basically, they bring nothing to the table.
But Vince died in 1997 and people still talk about him. In the 1980s, I read everything I could that Gironda wrote and then I went to his gym and trained with him for 3 days. I learned more in those 3 days about training than from any other individual person in my life. In the early 2000s, I made a couple DVDs that sold well that showed Gironda's exercises. I also coached people successfully to national bodybuilding, fitness, and figure wins.
In a nutshell, his techniques work well, but are often greatly misunderstood. No set-and-rep scheme is magic. They are simply effective and get a result. But you have to dive in, switch them up, etc., to make long-term results. You don't get on 8x8, for example, and think that you're going to win Mr. Olympia, which is what some think.
Also, what he did understand well was how to stimulate muscle for great in terms of how much work to do. And also how often to train not just weekly, but over months. His 3 weeks on, 1 week off, for example, is brilliant. Training the same muscle 2 or 3 times a day also works -- for a period.
As far as bodybuilding trainers go, this thread is correct -- he was the GOAT.
DAS