So I shared this in another discussion and thought it could warrant its own topic given the discussions on the rare trees and their drop rates.
I believe that the tree propagation mechanics should be changed overall, which would allow a more immersive and enjoyable experience. At the moment, to get tree seeds you need to break leaves and hope rng works in your favor. For the most part, it works fine, but with the introduction of new rare trees, you end up with diminishing returns due to the low drop rate. Those trees can literally go extinct over time in a game.
So instead of having to cut the tree downs to get seeds, give each tree a chance of generating saplings or seeds near and around it. You can then collect to replant, or, if the seed is generated on good enough soil and left on it's own, it'll end up growing. This would eliminate the diminishing returns issue on rare trees without forgoing the rarity of them. The player has a choice; cut the tree for its wood immediately, or cultivate the area around it to eventually get more seeds for more trees.
So on the whole, it would encourage sustainable tree husbandry. Instead of clear cutting entire forest, you can do selective cutting, allowing the forest to generate back over time. Prefer a particular tree? Cull the others and keep only the ones you want growing. A self sustaining and regenerating forest provides a much more immersive experience and provides a choice and consequence with how the manage their world.
This would also make edible nut bearing trees more beneficial too, like the new walnut, allowing repeated harvests of "fallen" nuts without the need to kill the entire tree to collect.