Additional conflicts that exempt a person from at least some mitzvot - on this case, the same people who are involved in the writing or selling of Torah scrolls, tefilin, mezuzot, and techelet are exempt from Shema, Amidah, tefillin, and so on. Also, travelers are exempt from sukkah. As are guardsmen. Plus, the idea that the temporary sukkah is akin to dwelling in your temporary house. Plus: Abaye and avoiding the Angel of Death.