In classic, when you click on a proof in the document list, and then look at the details window on the right, it tells you right away the status of the proof - whether it's pending, approved, changes required. However, in the new experience, it doesn't have this information right there. You can still find out, but you have to click around in 2 or 3 different screens. I reference this status frequently when we have multiple proofs in one project where some may be approved, yet some may need changes - it's essential to see the true status at a glance. The letter "icons" only say if a decision is made, but not what the decision was.