Whilst I understand your point, that's a matter of choice (or needs). You can perfectly buy, cook and eat 3 times/day without wasting too much time. Of course, if you want to have a gourmet experience in every meal it would be complicated.
I have had different phases in my life (currently I eat mostly paleo), and even though now it is the moment of my life when I spent more time cooking, I used to cook only once per week, having to re-heat the food on each meal.
You can also prepare food using slow cooking if you know the time you will be having the meal.
In my case, I "parallelize" and I work/study/work out/whatever while things are being cooked.
I am still unsure of the viability of these systems where they mix every single thing "needed" by the human body. How much time is needed to ensure this method of feeding is viable for humans?
"How much time is needed to ensure this method of feeding is viable for humans?"
Yes ha ha.
(For those who don't get the joke there's long been available a liquid meal replacement called "Ensure(tm)" as with many "tech" novelty stories a supposed inventor is actually just walking on very well trodden ground rather than inventing anything.)
A quick google suggests that ensure is marketed as a high calorie product designed to help you gain weight. Is there another version of it that's nutritionally complete and low calorie like Soylent (supposedly) is that I'm missing?
There are several meal replacement programs sold in the dieting community. I was on one for three months where I could choose to consume zero solid food and get all my nutrition from powdered soups and shakes; the US equivalent seems to be Medifast, though that includes a single food meal daily. It was not a healthy plan, but my energy levels were great and I lost a significant amount of weight in that time (45 pounds or so). The composition was designed to induce and keep participants in ketosis, but I don't see why a little more carbohydrate couldn't be added to avoid this.
I have had different phases in my life (currently I eat mostly paleo), and even though now it is the moment of my life when I spent more time cooking, I used to cook only once per week, having to re-heat the food on each meal.
You can also prepare food using slow cooking if you know the time you will be having the meal.
In my case, I "parallelize" and I work/study/work out/whatever while things are being cooked.
I am still unsure of the viability of these systems where they mix every single thing "needed" by the human body. How much time is needed to ensure this method of feeding is viable for humans?
PS: the drink kind of reminds me of Wall-E...