The plans are made at the lower levels of the company, and basically rubber-stamped by senior leadership
While this might be true in a healthy company, it’s not true in every company and companies where the senior leadership makes decisions while ignoring the lower levels are unpleasant to work in.
I think the original post is missing exactly this. Decisions are made in very different ways in different organisations, and the process and outcomes for those decisions directly affects everyone who works there.
Asking this question is not missing the point or assuming any world-view. It’s asking how your company does this very important thing.