Work / life balance, in reality, is a myth. To believe we can balance our work and life to the "nth" degree so that everything fits perfectly in its place assumes that life is controllable and static, at least long enough to control it. Nor does it take into consideration all the external factors at play which we have no control of.
Years ago one of the lead performers for the Cirque du Soleil was asked how he can keep his balance. His answer, which definitely applies to this was, "I don't keep my balance and stay still. I'm constantly readjusting".
To have any sort of a balanced life we have to learn to dance in real time with whatever comes our way. That's what keeps us resilient, readjusting and being able to stay psychologically balanced no matter what.