Because we are talking about what goes on in the most stressful of situations. One in which there may not be time to figure out:
Do I "grab gun, squeeze trigger, go boom" or do I "grab gun, sweep safety, squeeze trigger, go boom".
What I'm saying is, commit to a Condition, in my case Condition 2. The 1911 guys will be in Condition 1.
If you're sure you won't be confused in the moment of truth, that's great. Me, I want less things to think about.