Try to trash a web folder, site with many small files around 10 t0 30 mb with any ftp client and lím sure you will change your idea. It can take hours, no Joke. This is a big problem if you have to replace many files or a site rapidly. That simple point make me doubt that any server system without a integrated file manager is suitable for business.
Any web hosting service hosting out there have their own file manager, deleting files, folders, sites take seconds because itís directly on the servers. Do you think having a ftp client residing on people computer with all the password and entry point to websites are safer, Think Again.