As I think it says in that article, it's best to wait for now. There's nothing to be achieved by rooting yet and it'll be best to wait for the protection of SuperUser/Su.
Sent from Nexus 5 or 7.
On a watch there isn't very much data to be lostwell we could at least unlock the bootloader for now since that is the easiest thing to do and most certainly wise when we first unbox so we wont lose any data like if we have been using it for a few days.