Because that's a sprayer, a spray that makes a cloud of fine droplets. Perfect for making a film of oil on a griddle or skillet.
Some here are the reproach that "spray oil like a cloud of mist suspended in the air." But it is precisely the most of this unit.
To make a jet to meter, use for example the other model of the same brand with outdoor stainless steel body and without air pressure.
The only criticism is of course the body is plastic (potential migration of BPA and other chemicals because oil is a solvent that attacks the plastic) and not glass, but we know before you buy.