The sales tactic that protein powder of any kind has magical properties that will add muscles to you is the part that is BS.
I made better gains by just increasing overall calories than just focusing on protein.
There is a coach on professionalmuscle who used to eat like 500 grams a day for many years but now he thinks 200 grams from animal sources is enough even for a heavyweight. He doesn't count the incidental protein from carb sources even though that can be quite a few grams. Obviously there's a ceiling and then carbs might help you more and if you are deficient in essential fatty acids that is important to look at too.
Nasser made incredible progress in I think 95 and Milos says he told Nasser to up his protein to 450. Nasser went to 600. Milos credits the protein to a large part in that progress and we know Milos doesnt shy away from crediting insulin and so on so it seems he really believes it. The progress was so dramatic Chris Aceto was trying to figure out what Nasser had done. He asked if Nasser had taken T3, and Nasser said, "yes 25..." Chris thinking he meant 25mcg, and then Nasser goes "...tablets a day." He was a bullshitter.