Ask why a change was made and get an answer against the diff itself, with the surrounding context already loaded.

Findings arrive ranked, so the one that will break production is not buried under forty notes about spacing.

A queue takes each approved change in turn, rebases it, and only merges once the branch is still green.

Break one long change into a sequence of smaller ones that still read as a single story from top to bottom.

Comments, checks and the diff sit on one page, so nobody has to reconstruct the argument from three tabs.