Interesting that the author didn't mention ambient light levels explicitly.
A constricted pupil (from daylight) has a much greater depth of field than a dilated one (from darkness). So everything will appear sharper in the light of day.
Do at least some practice in low light conditions.
> That last number might be twice as large in the dimmest of light or half as large in bright light; and the blurriness from being out of focus scales in direct proportion to it. So if you’re shooting in full daylight, you might have only half as much blurriness as shown in the following images. But your enemies may not do you the courtesy of attacking in full daylight.
A constricted pupil (from daylight) has a much greater depth of field than a dilated one (from darkness). So everything will appear sharper in the light of day.
Do at least some practice in low light conditions.