[altintx]

You often need the chemical properties of sugar to maintain texture. It’s not just a question of flavor or sweetness.

[idle_zealot]

You can get ketchup and chocolate without any sugar at all.

[tourmalinetaco]

No added sugar, you mean? Tomatoes and cacao both contain natural sugars.

[az226]

You don’t need sugar for textural reasons for either chocolate or ketchup. It almost surely has to do with taste.