The soylent thing always struck me as a bizarre Silicon Valley fad with very limited appeal. I haven’t done a study but I would be very confident that most people simply enjoy eating food.
I’m actually in the middle of a bad GI flare-up, and soylent is a god send. I forget to eat, solid foods are hard to digest, I oversleep and miss meal times, etc. A bottled soylent helps me get back on track quickly.