Fruit supply in the equatorial forests is less seasonal, whereas in the drier areas it is tied partly to temperature, and partly to the seasonality of rains. Many of the wild fruits that we ate have chemicals in them to dissuade people and other animals from eating them before the seed inside is fully mature. If the fruit are eaten before the seeds inside have fully matured, the whole effort of creating and providing a dose of sugars, minerals, vitamins and proteins wrapped in a colorful skin has been a waste of precious resources. So the tree provides enough sugars and other goodies to be attractive, but only a super abundance where it has to compete against it's own species to draw the fruit eaters. Well, it probably depended on the type of fruit.
Some fruits are moist, hard to dry, and break down quickly.
This is generally typical of tropical fruits. Others are somewhat mealy, almost floury, with much less water, and dry quickly in arid or hot climates. These can be stored for later use. Fruits of the Southern African Mongongo tree , Ricindendron rautaneii, not only provide an astonishingly nutritious nut, but the thin, spongy, rather dry outer flesh is date-like, although not as sweet as a date. Even when the flesh has dried and shriveled up, the now crumbly flesh is nutritious.