“ or a Linux user, you can already build such a system yourself quite trivially by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem. From Windows or Mac, this FTP account could be accessed through built-in software.”[1] vibes.
Convenience features in software are huge and even if a system is well designed a system that abstracts it all away and does it for you is easier, and most new users want that, so it often wins. Worse is better etc