Instantaneous automatic synching with Dropbox?

Is there a reason why no option exists for instantaneous automatic synching of DT 2.5 via Dropbox? This is one of the great conveniences of cloud synching and is normal with just about all of the many apps I use with Dropbox or iCloud. It means you have immediate access to an identical copy on other devices without having to set times or synch manually, and can be very useful. Doubtless there are good technical reasons, but is this likely to come later?