Static analysis can always back you up when the time comes. But by the time it is done, you will have drunk gallons of coffee... That's why developers of these utilities are always looking for a way to make users' life easier and save time.
The incremental analysis became the result of this search. If you want to learn more about what it is and how it is related to a compiler, you are in the right place.
Enjoy the video and have clean code :)