I swear if I see this video presented as "evidence" or something or other one more time, I will go on an alcoholic binge.
This kind of thing is an example of faulty thinking that humans routinely engage in, even when they have experience to know better.
Lots, and lots of people have broken through bench press problems by simply recognizing the importance of back work of all kinds. This work has and will take all kinds of shapes. But the prob is that out of the hundreds of people saying they did rows, this and that and there benching improved what we will remember is the more theatrical examples. The extreme ones.
But before I go on, one thing has to be remembered: It is very difficult to make a correct causal inference about how and exercise from another class of movements impacts a lift. There are just too many things going on in training, recover, etc. at any one time to make these inferences, which are difficult even in a 'scientific' setting.
Get 10 guys doing all sorts of rows with good technique and one doing "dynamic rows" from the floor or some such thing…you remember the dynamic rows. Likewise this video out of hundreds of row videos would be remembered even if Kroc weren't well known. What is evidence of something tends to be what is readily available to memory.
I guarantee you that if you watched a bunch of lifters doing a snatch of the same weight…the one who screamed and danced and psyched himself up and basically "looked" like he was lifting more would stick more than all the others. Later on this would become "evidence" that screaming and dancing before a lift made you stronger. Which may be true, at least for some, but that ain't evidence.
You gotta think about training a bit dispassionately. I myself am not "passionate" about my training, I am passionate about my results. Do you see the difference there? I am passionate about learning but when it comes to training it is the results. I don't get precious about how I get a PR, only about the PR itself! This way I can view the process in a non-subjective way allowing me to more accurately gauge it's benefits and drawbacks. I do the same thing with the people I help.
One thing I've learned though lots of trial, error and PAIN is that many times the long term drawbacks outweigh the short term benefits.
And I am beginning to believe that this is the problem with all the 'experts' who scream and shout any time their views are challenged. It's about them instead of the results they get.