Whole fruits are a treat that can be tolerated by a healthy person in very moderate quantities. Think about the quantities you would get if you went out physically picking fruit off of a tree. So not a big bowl of easy to consume fruit from the grocery store, but when you put the physical effort in.... It's ok

There is no essential nutrition in fruit, historically, the role of fruit was as a fattening device before winter. An opportunistic caloric boon.

The biggest argument in favor of citrus fruits is there vitamin c. In the modern dietary context with really high blood glucose levels there is competition for the natural vitamin c pathway, the glut4 receptor. Citrus, by virtue of flooding the body of vitamin c, gets enough vitamin c into these cells and wins the competition with the blood glucose levels.

If a whole fruit offsets something worse you could eat, like a candy bar - then yes it is healthier then a candy bar, but it's also healthier then a cigarette. That doesn't tell us much about its essential levels of "health" in isolation.

Tldr: whole fruit is a sometimes treat, but it does not contribute to your health.

If I remember my highschool biology correctly (which I probably don't, so take this with all the grains of salt), natural sources like berries, fruits, etc... create natural glucose which is what every living organism (including us...use for energy). Meaning when we eat berries and fruit, that natural glucose doesn't need to be converted or processed in order for our body to make use of it. That also gives it a more stable effect in our system.

Refined sugars, on the other hand, need to be processed into glucose before it can bind to (oxygen? I think?) and pass into our bloodstream. That process leaves a lot of junk leftover which can have detrimental effects.

Again...I'm trying to remember a 35 year old highschool biology course, so correct me if I'm wrong.

It's the vitamins. These tiny black things that always crawl on top of the fruits...