Brad Fitzpatrick was microblogging that GitHub code reviews are still garbage. We pick up the summarize the thread spanning 2013 - 2021, quite a bit of time to improve Github pic 
> GitHub only lets you leave a comment on a line during a code review if it's in the immediate vicinity of something touched.
> Gerrit is better. Google's Mondrian then Critique are better[0]. Reviewable is better.
>Nearly everything is better.
>[0] latest
Comparing code reviews at Micorosft vs Google...
> Caitlin Sadowski, a researcher at Google, and others have performed a study to understand Google’s internal code review processes. This study is similar to the code review study at Microsoft, which makes it interesting to compare the code review processes at the two companies page