But obviously, it's not that you have fun eating because you're unhealthy, it's that you're unhealthy because you eat stuff for enjoyment.
Similarly, being unproductive isn't fun in itself, but having fun means almost by definition not being productive. If a hobby is productive, it's not really a hobby.
The more interesting take to me is that to live a meaningful life, you probably want to do a lot of things that are not labeled "productive", and take paths that are not labelled as "healthy".
For most of us the core of our life doesn't fit into neat categories, and trying to throw away stuff that aren't "productive" wouldn't help.