Five thousand times yes to the concept of an ecosystem.
The idea of the main character telling us a story seems off. I'm sort of fond of the open ended style, and would prefer that (us) the protagonist remain anonymous. I would however l…
With the current direction of the game, I do think that adding weapons runs counter to the experience of Subnautica. It isn't even really about whether or not to have more weapons, it's whether or not killing should be incentivised.