Let me put it this way: I don't think it is an uncommon belief that "adding fruit" to an existing diet will have benefits. But, in fact, if you are meeting your caloric and nutrient needs already, it is unlikely it adds anything (except fiber), and it is plausible it is causing problems (increasing possibility of diabetes, adding extra calories). Veggies are a safer add.

In both cases, you probably need to be rebalancing and not adding things, but, for the same reason, it is sensible to err on the side of much more veggies than fruits. However, because fruit tastes like candy (and perhaps because you don't have to cook them, generally), people reach for adding more fruit to their diets, and this is likely sub-optimal. You should almost certainly be eating much more vegetables than you should be eating fruit. I.e. I'd say healthy is more like 80% veggie, 20% fruit, if you are putting them in the same category.

Maybe 50/50 is perfectly good too, but it seems pretty clear 100% fruit and 0% veggie is the worst possible choice, but 100% veggie and 0% fruit is perfectly fine. This should bring into question the appropriateness of the label "healthy" for fruit.