Regarding "real fruit", how much sweeter is a tomato, an orange, or an apple today compared to past centuries?

Haven't most if not all of the commonly available (popular) fruits today been refined through selective breeding to be more appealing to us? What was lost vs. gained in this process?

(I have no idea, I'm not trying to be rhetorical. My guess is lots of more sweetness and perhaps less fiber, in a much larger fruit.)