So your argument against it is, "somebody else already made something similar so why bother"?
Other replies have given me additional information which I'm going to go over. Your's was setting up a straw man argument.
files.soylent.com/pdf/soylent-nutrition-facts-2-0-en.pdf
Soylent is still low on protein for my tastes because I lift weights and I'm shooting for at least 150g a day.