Because of the way most non-text files are encoded, it's nearly impossible to collate changes in the way a VCS requires. At work we're using a graphics engine w

Because of the way most non-text files are encoded, it's nearly impossible to collate changes in the way a VCS requires. At work we're using a graphics engine which stores layout data in binary blobs, then exports those to XML(Don't ask me why, I don't know). As a result, you would have to use their IDE tool to perform any merges, and because of that you can't annotate/blame the file at all, which eliminates a lot of the usefulness of the VCS as a repository of history. When companies start shipping real comparison tools for their binaries then you might see more widespread adoption.