And yes, I realize there are people getting blood tests. The human body can be surprisingly resilient, and whether or not the deficiency is in iron or something else, it may take a long time to present. My main objection is to them marketing this essentially as a beta release of an end-user product already.
If the purpose behind all the testing were to explore whether a meal replacement like Soylent might be a viable method of maintaining peak human nutrition, with years of planned research before jumping to conclusions, I would be all for it. But it seems as if they've already presumed that an all-in-one formula CAN be engineered to provide for a healthy diet, and are focusing exclusively on arriving at the optimal balance of nutrients to deliver.