It's the job of all engineers involved to utterly understand one another. That goes for junior engineers cranking out unit tests as well as for architecture astronauts.

If someone here is a junior and gets "figure it out" from some strategic level engineer, ask professional for clarification or a team-up until you understand. Involve management if the other engineer is uncooperative or fails to help. It's their job to explain slightly more than it's your job to understand.

If all else fails, find an organization that expects the architecture astronauts to be explainers in chief as well.