Nose hairs although sometimes annoying to some people are very essential to your nose and health.
The purpose of nose hairs is to act as a defense system for your nose.
The nose or nasal hair keeps harmful debris out of the body system and maintains moisture in the air that you breathe to keep your nose from drying out.
Blood vessels in the nose are very dense and also very tiny and easy to crack when the air is dry which can lead to nose bleeds when it's dry out.
So if the air is dry then your blood vessels in the nose can crack and lead to nosebleeds.
So by trimming or plucking the nose hairs you get rid of that natural defense system in your nose which can be a bad thing.