Coca Cola 140 calories 39 grams of carbs
2 medium apples 144 calories 40 grams of carbs
I think that right there is why no one worries we'll ruin our health eating fruit: hardly ever do you see someone gobble down two apples in a row.
Fruit naturally gets eaten in natural quantities - an apple here, some grapes there, whatever. Fruit juice is fine if it goes on the menu the same way, like a glass of orange juice with breakfast. Sucking down fruit juice all day would be hard on you.