'Capture' the lesson - annotating calls allows you to track progress and refer back to things you're working to improve, as well as things you already do well. Without annotations, it's much more difficult to refer back to examples of great calls/skills to improve on
Skip to relevant parts of the call when reviewing
Self-correct - by self-diagnosing and writing out comments, you are more likely to remember what you need to work on (that you may not even be aware of until you listen to yourself on the phone), and what phrases you say/questions you ask to ensure a great call. You'll be able to make changes faster on your own than waiting for feedback from a leader.
- This is the same as taking notes during a meeting or class
Help other users (new hires, mentees, etc) quickly access relevant parts of the call
Annotations will help leadership identify which calls to add to the Best Practice Library -- highlight where you're a rockstar!