Many tropical fruit species seed interact with the animals that eat the fruit, go thru the digestive system, get coated with feacal matter, which may be protective of pathogens or dissolve the seed coat. Many seeds fall and germinate in the surface leaf litter, or on the bare soil in the rain, without any covering.
Being outside the tropics, I found it often easy to germinate seed in a hot summer climate, but difficult to get many thru the first or second winter in cold wet pot mixes.
On the other hands friends in the tropics seem to plant seeds in bags of loamy soil, in the rain, under a shade tree.
One friend threw Avocado seeds out his kitchen window into the rainforest to grow his next lot of trees, and he was never running out of Avocado fruit.