Yeap I get what you are saying. Yes all 26 vitamins and minerals (a large proportion are not added and are natural) are essential. An essential nutrient means the body can’t make the amounts required of that nutrient so we must get it from the diet.
Just because something is synthetic doesn’t mean it’s bad. The chemical structure of vitamin C for example is exactly the same whether it’s natural or synthetic, your body can’t tell the difference.
I know I have chucked a lot of articles your way but this can explain it a bit more: How Well are the Vitamins and Minerals in Huel Absorbed?