The amount of changes that your OS goes through (downloading applications, applications creating files, applications changing files) is too much to update on a

The amount of changes that your OS goes through (downloading applications, applications creating files, applications changing files) is too much to update on a diff file. Although, for the major changes I feel the major OS's should add the ".diff" file called updates.diff and describe the major updates in your laptop. This should also happen each update, we need to know what updates are going to be installed, and what is the purpose of doing this?