He has; for me, cooking is about three minutes of effort spread out over the course of fifteen minutes each day.
The main benefit to a Soylent-style diet is that you get all the micronutrients and so on that are normally locked away inside vegetables, which take an inordinate amount of time to prepare and consume, in one quick drinkable source, without any concerns about pesticides or fungi or so on.
that are normally locked away inside vegetables, which take an inordinate amount of time to prepare and consume
Use frozen pre-sliced vegetables. They're usually competitive with, if not cheaper than, fresh produce; you save a lot of time preparing them; they taste just as good to me (and better, in instances where it takes a long time to eat your way through a purchase and the fresh vegetables are, shall we say, less than fresh by the time you eat them). You can easily dump them into crockpot recipes, or you can just put them in a bowl, microwave with some herbs/spices and butter, and reheat as necessary.
Rob Rhinehart's food replacement Soylent now has a crowdfunding campaign.
If you're interested in one or more of these benefits, send in some money! There is also a new blog post.