Its really difficult to understand what the show wants to communicate as as whole but episode wise this one especially makes sense.
The narrative isn't new but I guess it wants to say that Good guys have equally shitty lives. We are so focused on Mr Corman's defects in personality and the choices he makes that it was required to be shown how a man very different from him has his own struggles, that even if you try to do good in the world, be wise and stay positive, life finds ways to fu*k with you regardless.