Comment by HenrikAngelstig

Any software – even email – can be designed so users enter a flow state. They key things to optimize for is SPEED and GOALS.

If you create a compelling goal, and optimize your application for speed, the natural outcome is flow.

This podcast episode from Acquired explains how: https://open.spotify.com/episode/0hNxHPkfzucjeoJ5DmKp2S