Don't knock the benefits of relaxation. A refreshed soul can be a truly creative soul, and a truly creative soul is a productive soul.
It's said that we always need 20 minutes after lunch for relaxation only and that always when in trouble, stop everything you're doing and let your mind free, that the answers come easily. I guess it's worth trying!
If something is worth a particular action, or if an action is worth doing, it is considered to be importantenough for that action.
It is worth pausing to consider these statements from Mr Davies.