> normal trees will always outcompete fruit trees

Not. Not always. This is a too simplistic point of view.

Is like asking "how many penguins can be seen in this photo of the sahara?" If the conclusion is that penguins can't compete with camels, is a deceptive one.

This forest is a conifer forest. Put the same conifer in a place suitable for growing walnuts, figs, or hazelnuts and we will see who kills who.