I guess the point is, if you're stepping through the code, you want/need to see what effect it is having on the worksheets.
In that code if we select the targeted cell then it will call some macro in it.
This can happen with recorded macros that have the word Select used frequently.
If this does happen, you may need to repeat the line: Application.
While Excel will set this back to True whenever focus is passed back to Excel (your macro finishes) in most cases, it pays to play it safe and include the code at the end.
You may even find in some cases that Screen Updating is set back to true before your recorded macro completes.