Great singing is simple, but it can take many years to find the simplicity. Usually there is difficulty layered on. A large majority of the activities around effective voice cultivation have to do with removing difficulties, taking down barriers, stopping unnecessary actions. Building strength, flexibility, and artistry is fairly straightforward, but is hampered by all the extra stuff in the way. Some lucky people never layer on much garbage, but many of us do.
Whole careers in the voice training scene are now based on gimmicks, scientific approaches, or products. It is easy to forget why any of us were interested in singing in the first place, with all the science and industry in the field. I hear people making broad claims that teaching students about (insert favorite body of knowledge or “system”) makes every student better, and it is so obviously untrue. There are, and were, many great singers in many genres that didn’t have to know about anything scientific, analytical, or mechanical in order to thrive.
So it’s your choice. How much do you want to load up on all of this stuff about the voice? Does reading all the latest books and engaging in scientific or other Talmudic discussions online displace time spent listening to music, making music, and getting in touch with your own voice, body and soul? If yes, is that OK? Is a “balance” between book knowledge and empirical knowledge required when people in the past didn’t concern themselves with the former?