"Inability of an Unmodified Capability"

Often I defer a problem expecting unconscious processes to find a solution.
This often fails.

In my first regular use of e-mail (circa 1968) the group exchanging email were mostly the same room.
We would often send e-mail to a person within easy speaking instance because you could directly see that he was occupied in another conversation or else deep in thought.
The response to the e-mail might likewise be conditioned on state of the asker.

Debugging complex software.
I noticed that it was taking a couple of hours to get back my mental state before I could resume progress.
That duration challenged my attention span and progress was grinding to a halt.
The solution was to document my mental state as a living document.

E-mail needs better salience markers:
  I am hung up
  FYI
  Next time you think about x, look at Y.