Thank you!
1. I think it can be compared to a process of rendering the charts on your local machine to preview the changes and possibly pasting them in your PR for the reviewer. Sort of like mani-diffy by fully manual, yuck.
2. The other obvious comparison is with a process where diffs are reviewed in the ArgoCD web UI, assuming you have all your ArgoCD apps in "autosync: no" mode. This would be after the PR is merged, thus fracturing the review experience, not ideal. It would also cripple ArgoCD a little as the autosync feature is very key to the experience.