UDF, XFS, ZFS, <pick your letter in the alphabet>
are all useless, as long as IFS is not working, which will not work w/o CC with will not work without MM, with will not (be) work(ed on) without a new drupal site working.
So, since community opinion is asked
, I would say that spending time on UDF is a waste of developers' resources. Unless, of course, there is a developer that want to work only on that: a hack to make UDF somewhat work in current
ROS (but will be thrown away once IFS is working), adding probably some subtle bugs in disk read/writes in the process. UDF itself lends to this, with its many revisions, that not all the OSes support the same way (some examples
are given in the Wikipedia). Also, I can't imagine anyone doing photo/video editing or database server on current versions of ROS, and I don't see any other applications that will need files larger than 4GB and disks > 2TB. And if really-really needed, one can play with clusters > 32kB or even sectors > 512B.
To sum it up: FAT is not ideal, but at this stage of the project it is "good enough (for everyone)"