I think adding some non-hostile creatures would add a lot to the game, especially with the new wawsps would give way to creature interaction. Them buzzing out looking for prey and actually taking it back to their nest would be cool to observe.
There can still be a challenge that docile creatures can bring as well. I imagine an example of a "bush scuttle bug" where they go to tree tops and replace the leaves with their own body (just a big sphere with fuzz in my head); this would give way to the Koalath dropping down on the player, or more koalaths being able to drop at a time (because the bush scuttle bug makes the tree more stable for example).
Though it's cool there technically are neutral animals now, the wawsp larvae, though I guess you could argue they would grow up to become wawsps so it doesn't count.