I don’t agree. A PhD student should not prioritize work-life balance. Getting to do a PhD is a privilege. You are paid to think. There is no pressure for you to be economically useful. It is a unique opportunity to push the boundaries of human knowledge and produce something ground breaking. And nothing great ever happens without complete devotion. Look at everything that moved and shaped the world. Every single person who created anything meaningful, in science, in arts, in music, in movies, devoted their lives to their craft. Extraordinary outcomes require extraordinary inputs and some degree of sacrifice. Sure, have work-life balance during your PhD. But be content a mediocre outcome.