I think it depends on how far you look back.

Humans have been selectively breeding the sweetest and largest fruit for almost the entire history of agriculture.

"This tree makes the tasting apples in the orchard, so let's plant it's seeds." Repeat again and again, generation after generation.

I understand the original wild apple wasn't much bigger than a crabapple and was quite tart.

Corn used to be much smaller and probably had less fructose.

On the other hand, is the apple sweeter than it was in my mother's day? Probably not. But the apple of a few hundred years ago was probably less sweet. The apple of the cave man/woman era was definitely much less sweet and much smaller.

Sadly it doesn't matter to me, an apple has more than 20 carbs, and that's my limit for the day.

Bob