Obviously, that is the extreme on the opposite side of the spectrum. But from what I recall reading, daydreaming, evenly moderately, can be somewhat unproductive. I mean that in the sense that daydreaming can provide the brain with a shortcut to a feeling that would be better served if an action provided it.
For example, one can daydream about going to the gym and becoming more healthy. One can follow the daydream all the way through. However, at least in my case, I have caught myself enjoying the pleasurable feelings and the "one day, I will..." too much to the point that I never go to the gym.
I think my brain has learned that I can quell whatever feeling I am having in the moment by daydreaming. It's my brain's shortcut. It's as if my mind say, "Why spend the effort to do something when we can just imagine how it feels and enjoy the reward now?"
Like anything in life, the key is balance. However, creating that balance is not easy in my experience.