[5Qn8mNbc2FNCiVV]

I've had some PRs that would have required a ton of comments. There are usually two ways I handle this:

If the PR went in a completely different direction and missed the goal by a lot, I take ownership of it (with a brief explanation) and re-implement it. I then use the new PR for a pairing session, where I walk through both PRs with the original author for learning purposes.

If it’s mostly smaller issues, I schedule a half-hour pairing session with the author and review everything together, after preparing a list of issues.

Doing it any other way puts too much burden on the author to guess what the reviewer wants, and it slows down velocity significantly.