You answered your own question.

> If you trust them completely, you don't need to know what happens next either. Just trust them to do the right things, your leadership isn't required.

> The best leaders I've worked with were paying attention to things from the bottom-up as well as top-down.

These two statements are at odds. You first assuming that lack of trust would be the only reason he needs to know what happens next, then go on to outline another reason he and the larger organization would both benefit from knowing more.

It's not just about trust. It's about knowing what your team is up to so you can provide them the resources necessary while also working to remove any obstacles in their way so they can get shit done. That's what good management does, it's just rare to see in low-trust organizations that treat everyone like a cog to be micromanaged because no one trusts anyone to get shit done of their own accord for whatever reason.