Because grokking 20 diffs across 5 files is a lot easier than grokking the entirety of those files and the context on which they live. If you assume the rest o

Because grokking 20 diffs across 5 files is a lot easier than grokking the entirety of those files and the context on which they live. If you assume the rest of the codebase meets some reasonable standard of quality the diff should be the only important thing. That said, for particularly complicated changes I'll check out the code and read through it locally but diffing is surely optimized for the most common case.