[BurningFrog]

Coding shouldn't require extreme focus.

If it does, it's probably because your code base is an unstructured mess that can't be worked on without superhuman effort.

Many programmers have never spent time in a well factored code base and don't know how to write one, so this might just sound strange to them.

[SketchySeaBeast]

If you're implementing something new, or a new interface, or basically anything interesting, it's going to require focus. I don't know how you can add anything of real value without a high level of focus.

[BurningFrog]

Focus, sure. Extreme focus is a sign something is wrong.

I think the classic "one interruption makes me have to restart my 15 minute 'getting into the code' process" syndrome is a very clear sign that either your code is way too complex, or you have sleep apnea.