Earlier quoted context omitted.
What advantage does Soylent have over say, other meal replacements e.g. Slimfast, weight watcher shakes, juices etc that have existed for years before it and will continue to do so for years after? All I see is SV hype and marketing. In fact you just showed that Soylent is easily outplayed because you switched to a different drink already.
I drink a mix of whey/soy protein powder mixed in milk each morning. Does soylent have any advantages over that if I eat balanced meals the rest of the day?
Depends on how balanced those other meals are. There are some nutrients in there that are not in every ordinary meal, like methylfolate. You could think of soylent as a weak multivitamin plus macronutrients. In an early report a tester talked about a fantastic energy boost, and I'd wager he was deficient in one of the nutrients soylent contains. In the case of methylfolate, it's actually better than most multivitamins which only contain folic acid, which is harder to metabolize (especially if you have a MTHFR mutation).