Most of my previous companies required attaching a loom/screen recording of visual features cause the code really only communicates the logic. I've found that even for the PRs where you want to be super thorough and read every single line of code, watching the PR get tested brings you up to speed a lot faster.

Couple jobs had this too and I really liked it. The QA team we had it as a hard requirement. Optional depending on context for the devs.