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?

PS: the drink kind of reminds me of Wall-E...