While at the distribution point a hashed file method is used to keep different applications using the same file, the really need fro this, in my opinion, should be the client computers, we have faced a really annoying case where to install 4 different applications (visio, visio pro, project, and Office suite) the same group of files are used , Office 365 installer, so it cam be 2.5GB four times if all the apps have to be installed at the device. this has a severe penalty at the storage and the network at the user device