I appreciate what you're saying, but to be fair to those criticizing, this isn't the problem Solyent is advertised as solving. The stated problem that Soylent is advertised as solving is "food is a hassle", and it is also alleged to provide benefits for health and the environment. It's also being advertised as "perfectly balanced", "automatically [putting] you at an optimal weight", and "[improving] your focus and cognition". These are the claims that people are criticizing, not it's suitability as a last resort. If Soylent's message was "here's a better option for those who are desperate", I'm confident the responses would be less critical.
I'm more interested in seeing Soylent succeed as a benefit to people around the globe who literally cannot afford (or don't have access to) a proper healthy diet.