I can think of several examples where applying a process to a food does not make it something we should avoid (i.e. when a butcher chops meat, he/she is processing it).
Where do we draw the line between "safe" processed foods and "unhealthy" processed foods.
Surely you're a very intelligent person, and you know the difference between whacking off part of a thing, and making say, corn syrup. The latter is essentially one extremely purified sugar, with no nutritional value outside of, "sugar". The former is still a piece of meat.
Go to the grocery store and pick up something for sale. Look at the list of ingredients. Are all the ingredients listed, "food"? Or is the item you picked out itself just one food-item, like a banana?
It's not a perfect test but if it passes,that item is probably an OK thing to eat as part of your regular diet.
Do I want to subsist on olive oil? No. Do I want to use olive oil on my salad? Yes. Do I want to eat cake? Yes? Do I want to eat cake every day? Guh, no.
Does Soylent pass this test? Hell. No.
Not inherently a bad thing I suppose, but feels wrong because it's such an industrial process.