FTA:
When you're operating on the manager's schedule you can do something you'd never want to do on the maker's: you can have speculative meetings. You can meet someone just to get to know one another. If you have an empty slot in your schedule, why not?
Here's why not:
Taken in context of the essay written, this amounts to optimizing my time due to a lack of my superiors optimizing theirs. Taken on its own, I don't really care how my managers choose to spend their time as managers. But when the power differential surely speaks to the reality that managers will always concern themselves with what I'm doing-perhaps by nature of the manager/subordinate relationship-I think I'm in the right to expect some kind of reciprocity in making time for one another.
Good managers make the time for their subordinates. Average managers stumble upon the free time. Poor managers constantly reschedule.
I'm not against getting to know my coworkers and making time for general socializing as a means of "taking a break", but in the context of "makers schedules" and "manager schedules"...sorry. No.
I don't (necessarily) disagree with the essay (at least not as much as I usually reserve a certain amount of reticence for Grahamisms), but the suggested solution...eh. I need to hear a better motivating reason than this because this isn't about some hypothetical problem between me and people I'd like to get to know via "speculative meetings". This is about managers demanding so much of our time via "just in case we need you" meetings and turning right around asking us to be productive and meet deadlines in spite of said meetings.