Productivity
Jason Fried said that he thinks it's more of a "feeling".
If you get interruptions all day then you'll feel like you never got down and did some Deep Work. However, if you had most of the day to focus on one task without being pinged with notifications then you'll probably feel productive!
Related: https://99u.adobe.com/articles/17643/its-not-about-productivity-its-about-living-purposefully
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