AND even if your team is like the unique magical unicorn capable of understand the value of the task, you've still got the abstraction problem.
My best advice for addressing this problem is to (with their input) modify the template you're using for PR descriptions to have a heading that says something like "At a high level, describe what you did in 1 or 2 sentences" followed by whatever details are needed for the other geeks to understand & review the PR.