Narrow exit pupil binoculars may also be fatiguing because the instrument must be held exactly in place in front of the eyes to provide a useful image.
An exit pupil much match or be smaller in diameter than our pupil to receive the full amount of projected light, a larger exit pupil results in the wasted light.
For comfort, ease of use, and flexibility in applications, larger telescopic sights with larger exit pupils are satisfying choices even if their capability is not fully used by day.