> It also cleanly stores data for all apps in a single data/ directory, so you always have one directory that holds all the state, which you can easily back up and restore.

Ha! I'm store my data in /data for ages. The only difference is what at first I bothered with tinkering with datadir paths in configuration files, nowadays I just symlink /var/lib/whatsitsname to /data/whatsitsname. I'm lazy and boring.