But relative to what? The apps themselves are installed in /data/app, and keep their internal data in /data/data, neither of which you can access without root. For moving the app to work it would either require the appropriate parts of the app to be moved to the appropriate place in the SD card where the OS will look (which will only work if the phone software supports moving apps in the first place, in which case no need to risk doing it manually) or else placing links from the expected location to the new one (so the OS knows where to find things). I've been using *nix systems since 1989 and spent the early part of this decade hacking my phones, and relative paths by themselves won't solve the problems that manually moving files or folders would produce.
