Same here. Don't understand why Github hasn't supported this until now. I'm tired of reviewing PRs with thousands of lines of changes, which are getting worse nowadays with vibe coding.
What does Facebook use internally these days. I'm amazed that the state of review tools is still at or behind what we had a decade ago for the most part.
Previous iterations have been a bit dated in terms of UI, but modern versions are pretty good. What interactions are bizzare? Leaving comments, approving a change and running presubmit tests are all pretty straightforward.