Do you have experience with fruit trees planted too close? What happens when they grow up? Due to lack of space and soil, we have planted all kinds of fruit trees so close, within a couple meters from each other. Mangos, avocados, bananas, papayas, pineapples, pommegranate, plum trees, lemons, oranges, anona cherimoya, all growing in one space, still small trees and some giving some fruit already, but what will happen when they all grow up large? have you already had this experience?

They will start to infringe on each other which will probably cause problems.
Depending on mature size, they should be minimum 4 meters apart, more is better..

In home gardens, fruit trees of similar size are often planted 2 or 3 to a hole or in a row with a tree every 3 or 4 ft. They then form a single tree canopy but ... The rows and holes are spaced every 20 ft AND the trees are of similar mature size. I can't see your orchard of disparate sized trees growing so close ever working. Some trees will survive and take over (mango and avocado) but the rest will be lost.

Pineapple tree?