Defining a hotfix

A hotfix is a specific set of files that are updated. A patch usually has several files that will be updated. For a full release I would expect to have to reinstall.

Why doesn't Blizzard understand this? Why do I have to completely reinstall every single time they fix a single file? I know I only downloaded a small thing, it only took 1 minute. But the update takes forever because I can see it going thru each and every file.