I wonder to what extent the closed vs. open door dichotomy is true. In Deep Work, Cal Newport develops the point that rather than 100% open-door (interruptible) vs. 100% closed-door (uninterruptible) - we should mix the two. Knowledge workers obviously need to get feedback on their work and contribute with feedback to the work of others. You can also clearly keep your door open when doing work that doesn't require that much focus while also allowing yourself to get deep into something by shutting yourself off from the world at times. And you might miss out on really important focused time if you always keep your door open.