Fruit from trees with greening seem normal but drier less sweet. It just goes downhill from there. Maybe after it has it bad and almost dead by then you don't get much fruit though.
With sand it's the same thing if you have pure clay it's really bad soil and besides compost it's recommended to add sand. Pure sand is also bad other than cactus types though they benefit from compost too. Usually up north it's clay and sediment but I have seen layers of pure clay especially along a creek bed where it dug into the ground and you can see layers. Here it's dand and a few limestones shell then ground water. The lime makes it alkaline along with shells pure sand is neutral so it's hard to tell in Florida. We have a lot of pine and pine needles are extremely acidic so the acidity varies a lot.
Like a sandy loam would be a really nice soil. But compost is the main treatment for sand or clay though clay benefits from sand and sand from clay to balance it. But most tropical stuff leans towards Sandy soil anyway like citrus and such just not pure sand
Most tropical fruit tree's actually lean towards clay soil if it is even possible to make such a statement.
Have a look at the soil data for most tropical to equatorial regions where many common tropical fruits come from. Mostly clay.
And that is because clay is the smallest particle of a "rock" and rocks breaks down faster in tropical climates since the rate of photosynthesis is higher which means more root acid exudates and glucose to microbes. muric acid etc.
Tropical soils are generally not black cause less humates are retained since the temperature is not right for humate retention.
Mostly heavy yellow to red clay with carbon at 3-5%.
The citrus here does well in the heavy clay at ph 5.6. But it's not as good as clay higher in carbon (10-15%) since humates have higher anion exchange capacity and will raise ph a bit unless it's saturated with H. That's how liming works, it replaces H ions with Ca ions.
This olfactory expert made an excellent video about citrus greening and citrus in Florida in general.
https://www.youtube.com/watch?v=CB9Cmv1xDVg