When you install an application in linux, all of the application's files, such as its binaries, manual pages, and any libraries, get smushed together into the file system. Binaries go into any of the various bin or sbin folders in your system, manual pages go into any of the man folders, and libraries go into any of the lib folders. Soon enough your file system becomes a smorgasbord! It would be the same as installing every application on a Windows machine to the same folder. And good luck trying to uninstall anything! You don't know which file belongs to which application.