why you ask.
well its small, fast and light.
and his point was that the trigger is so easy to use. when you are playing front or mid, keeping as tight as possible, the less of a profile you show when firing the better, and this could mean having to fire from different positions.
on this video, the guy has actually made his own trigger from plexiglass. it is angled so that it is easier to walk with your hand not so upright., therefore, supposedly reducing profile.