The article linked to one of the author’s other articles which talked about how even if you love it, you start to be fueled by different energy.

> After working at high intensity for more than 90 minutes, we begin to draw on these emergency reserves to keep us going. In the process, we move from parasympathetic to a sympathetic arousal — a physiological state more commonly known as “fight or flight.”

> One consequence of relying on stress hormones for energy is that the prefrontal cortex begins to shut down. We become more reactive and less capable of thinking clearly and reflectively, or seeing the big picture.

I recognize that. Ive also noticed those stress hormones coming more often outside of work and affecting the rest of my life.

The article isn't saying that you shouldn't, or can't, work as you prefer. It's pointing out that work culture, particularly in the US, strongly pressures people to give up as much as possible for the workplace, and that's not a good thing.

Twiddling your thumbs may be the most important task in the universe, we simply do not know.