I'll expand a bit more on my point with the iron content of Soylent.
I picked iron out of the list to focus on because it's not water soluble and that makes it more problematic. I bet there are issues across the board with the nutrient content in Soylent.
Excess iron in your diet can be a health problem because your body has no efficient way to dispose of it. The main mechanism for shedding iron is via blood loss! You aren't going to die if you get even 40mg of iron in a day, but consistently ingesting too much iron can be problematic.
This is why you see vitamins with 3000% DV Vitamin C and 10% DV iron -- there's no harm (beyond expensive urine) in excess water soluble Vitamin C, but there can be harm with excess iron.
So if we look at Soylent, with 5mg of iron per serving (IF all of that is actually bio-available), it is not ideal even for the likely majority of its customers (adult men) and even if they only consumed Soylent.
The average adult male only requires an additional 3mg of iron per day, which can easily be exceeded from any number of sources: a multivitamin, a second serving of Soylent, eating a steak, and so on. It's extremely unlikely that the average consumer of Soylent isn't exceeding their daily iron intake (unless they're a woman, especially a pregnant one, in which case they have more wiggle room).
That isn't even considering a non-average adult male, who might need 4mg or 12mg or who knows what.
Excess iron (>20mg) can also cause "gastric upset, constipation, nausea, abdominal pain, vomiting, and faintness" [1] -- which can all be caused by lots of things, but are certainly areas where Soylent has struggled somewhat.
Mainly I just think it's disappointing that Soylent adopted a naive one-size-fits-all approach and doesn't really seem to understand what RDA and %DV are meant to convey. The FDA is faced with an impossible task to provide %DV for all people everywhere without considering any of their personal variables. Soylent should be trying to go a step beyond that, not just blindly targeting those numbers.
[1] https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/#h...