I'm in FL with very high humidity though, and I too get thousands of flowers with only 3 fruit so far. But this is the driest county in FL, so it might be less rainfall. I do think both watering, and humidity, are worth considering as factors when someone has trouble in a desert. In our FL dry season, even though I am supplementing a bit, I wonder if others with young trees also have trouble? But even in our driest month, the air is still as humid as most other states are in wet months.
Besides, there is a sapodilla that in indigenous to here, so I wouldn't think that my flowering trouble should be climate. But, it would make sense if there is a lack of natural pollinators possibly if they are picky between types of sapodilla, since the wild one is noticeably different from the Hasya. Or, it would make more sense to me that the problem for me is lack of other sapodillas nearby to cross pollinate with, because I doubt there is another one within at least a half mile if not a mile of mine, and my wild one hasn't flowered yet because it's still young.
Remains a mystery, when dealing with a plant that looks so healthy, continues to push new growth, and continues to have hordes of flowers. It almost seems like a plant that has all male flowers, for the ratio of fruit it bothers to carry... But very interesting to see Palm City's tiny neglected Hasya loaded with fruit! And to note that the larger one bears less. Perhaps one factor is too little stress for some plants? My plant seems very happy, so "too little stress" would certainly fit it! Lazy thing... lol