Highly recommend trawling through these forums and articles for a while to get acquainted with the stance that is generally held toward the majority of sports science, exercise physiology, and similar disciplines, as well as related studies, on this site. I haven't read many studies myself but it seems to be a mostly-agreed-upon consensus here that these disciplines and studies lack rigorousness and are ultimately not very useful.
What do you mean by an "essential requirement"? Essential requirement in order to do what?If true, then is it an essential requirement to be a coach of any sport, physical trainer or in this case, a Staring Strength coaching?
The Starting Strength coaches and staff on this website put a huge amount of time into providing free, high-quality material for anyone who wants to learn. The best way we can help them out in their work is to be well-informed before we ask questions, because almost anything we will ask has probably been discussed multiple times. It's probably best if you run through the site for a bit before asking about stuff that has been covered already.