Interruptions break concentration. More importantly, interruptions break Flow. It is usually lost for the day.

https://medium.com/p/the-magnificence-of-flow-c5fad8da35a1

Companies used to understand this; managers' foremost responsibility was to insulate us from interruptions.

https://medium.com/p/young-developers-what-you-missed-128e4cc7cc08

Then all that changed. Now companies place "team cohesion" over work quality or productivity. As though writing software is a social endeavor.

At Microsoft in 1989, when I first worked there, we were each given a sign reading DND, for Do Not Disturb, to put on our doors when we were focusing.

Anyone who did that now would be regarded as "toxic" and "not a team player."

The industry has lost its way.