Most people suffer from a limited culinary palette. Despite improvements in the availability of "exotic" produce, many people today do not know what say-- A lychee tastes like, unless they are asian, have asian relatives, or live in asia (or at least in proximity to local lychees) Should toady implement lychee drupes into DF, I would expect that they would taste like lychees. (as for what they taste like... Very similar to rambutan. Yes. I know that isn't helpful. Try explaining how an apple tastes.)
Are those Asian? They're moderately easy to find in summer in SA.
...now I'm craving them.
Lychee, Rambutan, Mangosteen, et al-- are all from various asian localities, and were introduced to SA for international production, which enables the fruit to be available for longer periods of the year. (Northern vs Southern hemisphere, etc.)
There ARE some native SA fruit trees, like soursop, that produce edible fruit that is quite delicious. It is my understanding that soursop has been imported to some asian countries, much like Durian and pals have been imported to SA.
Here in NA, the most we get are oranges, some varieties of banana that tolerate cold, and some cold hardy varieties of mango, and then only in the southern parts of NA. In the temperate regions, we have some native fruit and nut species, such as pawpaw (Different from SA mango-- closer relation to soursop, but very different texture and flavor. More "Banana custard" like.), North American mulberry, and black walnut. Most fruit trees are imports from Europe-- Apple, Peach, Pear, etc. There are some native grape species, such as the muscadine grape species, and the vulpis grape species. (In contrast to european vinifera species, which die horrible deaths here due to a native root parasite that vinefera grapes have no resistance to, called phyloxera.)
Mostly, we have wild pseudocereal plants that are frequently regarded as weeds and not as food plants, such as the various pigweeds, which are actually amaranth plants, and a motley assortment of noxious weed species that may be of dubious medicinal use. (Such as various datura species, and horrible things like buffalo burr, and tobacco)
Even in NA, few people realize that things like this:
Are in fact edible, and produce a useful pseudocereal grain in addition to edible salad greens. As I said, most people suffer from a limited culinary palette.