I had the strong feeling that this can be very helpful, but cannot wrap my head around why. Can someone explain why this is useful? This means I can maintain a

I had the strong feeling that this can be very helpful, but cannot wrap my head around why. Can someone explain why this is useful? This means I can maintain a set of "private" changes to a branch, say, better log messages, have this applied to the working tree, do non related changes in a feature, and commit my work without having to deal with the log message's lines?