I love the idea of taking well understood analog concepts and applying them to the digital remote workplace, but man, forced sync calls coming in on a whim without my control to ignore them sounds like my absolute worst nightmare.
If you haven't already, take a look at the section "Solving Distraction: Presence + Statuses + Calendar" in the article - I dive into our attempt to solve this problem.
Do you think our solution is insufficient? If so, any ideas on how we could further solve it?
I think having to clutter my work calendar with "I'm working" entries is a pretty clumsy way of signaling that I don't want people to randomly speak over Beethoven in my headphones. I my company introduced this, I would invariably "forget" to start the software at all, or would leave it on DND status permanently.
Personally I just don't see the benefit over a chat message saying "time for a quick call about <topic>? <zoom link>".