well it's also nutritionally balanced overall, over a year long shelf life, and doesn't take more than 10-20 seconds to prepare, and easy to carry in a flask with you
i mean i still eat real meals mostly but there are plenty of situations where you'd just want to sate your hunger anywhere at anytime instantly, like doing work at the uni library or riding a bike
Soylent is around $2.50 a meal, it's more of a convenience utility rather than food that you can taste and enjoy
if you have the time and resources to prepare proper food and eat it, you should