Cocoa soylent was just a better alternative to what I had as options for breakfast. Typical breakfast sandwich or cheap cereals were not particularly great.

I'm honestly not sure how healthy it is, but I'd be very surprised if it was worse than what I'd do otherwise.

Now I agree if you have 5 bottles a day as your only food source, that's probably not great. We don't really understand human food needs as well as we say we do, and we kind of just get by as a kind of coincidence through variety. Having the same thing over and over and over almost garentees you get it wrong, no matter what it is you have.