Comment 4 for bug 553105

.byobu disappears and the data in .byobu is found within the XDG specified directories. As for migration, I know Tomboy has done it, the information for which can found here: https://bugzilla.gnome.org/show_bug.cgi?id=518585

As for why, the answer is fairly simple: reducing the number of dot folders allows easier replication of data across machines, as admins can easily separate user data from user configuration.