Research bioavailability. What vegetable and animal sources provide is buffered nutrients, from which you metabolize generally less efficiently than from processed sources. Soylent doesn't have overages - so you don't need to worry about issues arising from taking in too much calcium, or any other micronutrient.
For example, the beta carotene in carrots doesn't have an upper limit for safe ingestion, but acts as a provitamin for vitamin A - your body will metabolize carotene on an as needed basis, depending on what's available. For nutritional purposes, your cells don't care whether the vitamin A comes from carotenoids or from Vitamin A supplementation.
Plants are made from chemicals. There's nothing magical about a potato's potassium that makes it biologically different after digestion than a banana's potassium... or potassium supplements. There may be beneficial phytochemicals that augment human health, but there's nothing particularly special about a plant source of a vitamin or mineral over a synthetic source, given that the same chemical is being metabolized in either case. In some cases, synthetic supplements are superior to natural sources as they provide a greater bioavailability - better nutritional bang for your buck.
Plant and animal sources of food are great, and sometimes offer phytochemicals or efficient sources of nutrients that are hard to get elsewhere.
So because some things are good as food, and oversupplementation of certain micronutrients is bad,
Please, when referencing studies, provide links. Studies show that 99.99% of all unreferenced studies are completely useless to further discussions!
Well, let's take a look:
So we don't know what we don't know, certain forms of highly bioavailable calcium supplements have adverse effects if you have too much, and plants have micronutrient sources.
You can rule out oversupplementation from Soylent, because they've designed it to match what the body needs, not 10000% RDA of ELECTROLYTES!
We're left with a comparison between: unknown potential benefits (or drawbacks) from phytochemicals , and well known, soundly established micronutrient minimums satisfied by Soylent.
Be aware that Ambronite is also potentially toxic with the amount of iron it's got. It's not enough to satisfy the minimums, you also have to stay under the upper limits (if you like your kidneys.)
Soylent is mostly vegetable sourced, processed macronutrients, with people who've lived for almost a year on it with substantially healthy results (the diy community as well has produced some very good results.)
The difference between Soylent's current formulation and a purely vegetable sourced formula is twofold: Soylent's processed ingredients cost far less, and you lose the unknown potential benefits and drawbacks of phytochemicals (unless, like most of us, you continue to eat real food and use Soylent for the drive-by meals.)
Since those are the only two reasonable criteria, given the basis of the discussion so far, there's no reason to ditch Soylent.