Yep, linux user here as well (writing this on kubuntu).

You know what they say, if it aint broke...
Look at the feature list of the new version and see if you really need something
from there that you can't have on your current system . If yes, upgrade, if not don't.

Eventually, you will have to upgrade when they stop backporting security updates etc, but until then do whatever you like. That' the linux philosophy.

Redwoood